Equipment catalogue

What Qing knows how to buy — and what it will refuse to

categories
1478
freely routable
1283
no export gate on the item itself
classify before outreach
141
control depends on measured parameters
never routed
42
advanced-computing ECCNs

42 categories are refused at the catalogue, not escalated

A PRC-incorporated entity cannot lawfully be the seller of an advanced-computing item (ECCN 3A090 / 4A090) to any destination worldwide, non-US manufacture does not escape the Foreign Direct Product Rule, and every credible PRC accelerator vendor is Entity Listed. Qing refuses at the catalogue rather than opening a conversation and escalating, because the conversation itself creates a record. See the compliance perimeter →

12 near-duplicate pairs need curating — they are why a matched requirement sometimes comes back ambiguous

The importer collapses pure reorderings and empty qualifiers automatically. It will not decide whether “(x86)” distinguishes a product — that depends on whether an ARM variant exists, and guessing wrong destroys a real distinction. These are left for a human.

  • 1.001U dual-socket rack server (x86)↔2U dual-socket rack server (x86)
  • 1.001U tool-less ball-bearing slide rail kit↔2U tool-less ball-bearing slide rail kit
  • 1.00Active optical cable (AOC), 400G/800G↔Active optical cable (AOC), 400G/800G, 3-30 m
  • 1.00Cable management arm (CMA) 1U/2U↔Cable management arm (CMA)
  • 1.00Enterprise NVMe SSD, U.2/E1.S/E3.S, 3.84-30.72 TB↔Enterprise NVMe SSD, E3.S
  • 1.00Enterprise NVMe SSD, U.2/U.3↔Enterprise NVMe SSD, U.2/E1.S/E3.S, 3.84-30.72 TB
  • 1.00Enterprise NVMe SSD, U.2/U.3↔Enterprise NVMe SSD, E3.S
  • 1.00General-purpose 2U dual-socket rack server↔1U dual-socket rack server
  • 1.00High-capacity QLC NVMe SSD↔E1.L NVMe QLC high-capacity SSD
  • 1.00Type 2 surge protective device↔Surge protective device, Type 1+2 and Type 2
  • 0.88Rear-door heat exchanger, active (fan-assisted)↔Rear-door heat exchanger, active (fan-assisted), 60-100 kW
  • 0.88Single-phase immersion dielectric fluid, synthetic ester base↔Single-phase immersion dielectric fluid (synthetic hydrocarbon / ester)
All 1478Cooling 296Power 270IT hardware 240Facility systems 212White space 198Optics & cabling 111Compute 72Consumables 49Prefabricated 30

White space

Each carries the questions that make two quotes comparable, and the traps specific to it

showing 60
  • 0U/1U horizontal cable manager (finger duct)机柜理线器/走线槽
    White spaceHS 8473.30per pcCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • 0U PDU mounting rail / bracket kit0U PDU安装立柱/支架
    White spaceper setCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • 100G QSFP28 DAC and 4x25G breakout100G QSFP28 高速铜缆及一分四
    White spaceHS 8544.42per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • 1U fibre patch panel / MPO cassette1U光纤配线架/MPO模块盒
    White spaceHS 8536.70per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • 1U tool-less ball-bearing slide rail kit1U免工具滚珠滑轨套件
    White spaceHS 8473.30per set (L+R)CN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • 25G SFP28 passive DAC25G SFP28 无源高速铜缆
    White spaceHS 8544.42per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • 2.5in 24-bay NVMe backplane24盘位 NVMe 背板
    White spaceHS 8473.30per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • REFURBISHED DRIVES WITH RESET SMART. The 2025 Seagate scandal saw drives with tens of thousands of hours sold as new after SMART counters were zeroed. RFQ defence: demand `smartctl -l farm` output (smartmontools 7.4+) on 3 random units — Seagate FARM (Field Accessible Reliability Metrics) records Power-on Hours and Head Flight Hours independently and is not resettable by the tools fraudsters use. A FARM/SMART mismatch is proof, not suspicion.
    • THE POWER-CYCLE TELL. Even without FARM, a reset drive gives itself away: 2 power-on hours against 2,400 power cycles is impossible for a genuinely new drive. Always ask for power-on hours AND power cycle count AND Percentage Used together — resetters usually zero one field and forget the others.
    • COUNTERFEIT CAPACITY. SSD firmware is modified to report far more capacity than the physical NAND holds; the drive writes normally until it wraps and silently corrupts. RFQ defence: require a full-span write-then-verify test (h2testw or `badblocks -w`) on a sample, plus the flash-ID readout showing die count and per-die capacity.
    • DRAM-LESS CONTROLLERS SOLD AS ENTERPRISE. Especially in M.2 2280 and cheap U.2. RFQ defence: ask for onboard DRAM size in GB (expect roughly 1GB per 1TB NAND), reject HMB, and demand high-resolution photos of both PCB faces — a DRAM package is visible or it is not there.
    • FIRMWARE-ONLY 'PLP'. Sellers claim power loss protection with no capacitors. RFQ defence: ask for capacitor type and count and have them pointed out in the board photo; ask for JESD218 power-cycling test results. Real hardware PLP is physically countable.
    • M.2 2280 'WITH PLP'. 80mm boards rarely have room for a real capacitor bank; 22110 exists precisely because 110mm does. A 2280 PLP claim needs a board photo before it is believed.
    • THE NEARLINE HDD 'MANUFACTURER'. No PRC company manufactures hard disk drives. Only Seagate, Western Digital and Toshiba do. Any Chinese seller describing itself as the factory for 20-32TB nearline drives is a trader, relabeller or refurbisher. RFQ defence: ask for the OEM part number and an authorisation letter or upstream purchase invoice, and state in the question that you know no PRC manufacturer exists.
  • 2U 24-bay NVMe JBOF2U 24盘位 NVMe JBOF
    White spaceHS 8473.30per unitCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • REFURBISHED DRIVES WITH RESET SMART. The 2025 Seagate scandal saw drives with tens of thousands of hours sold as new after SMART counters were zeroed. RFQ defence: demand `smartctl -l farm` output (smartmontools 7.4+) on 3 random units — Seagate FARM (Field Accessible Reliability Metrics) records Power-on Hours and Head Flight Hours independently and is not resettable by the tools fraudsters use. A FARM/SMART mismatch is proof, not suspicion.
    • THE POWER-CYCLE TELL. Even without FARM, a reset drive gives itself away: 2 power-on hours against 2,400 power cycles is impossible for a genuinely new drive. Always ask for power-on hours AND power cycle count AND Percentage Used together — resetters usually zero one field and forget the others.
    • COUNTERFEIT CAPACITY. SSD firmware is modified to report far more capacity than the physical NAND holds; the drive writes normally until it wraps and silently corrupts. RFQ defence: require a full-span write-then-verify test (h2testw or `badblocks -w`) on a sample, plus the flash-ID readout showing die count and per-die capacity.
    • DRAM-LESS CONTROLLERS SOLD AS ENTERPRISE. Especially in M.2 2280 and cheap U.2. RFQ defence: ask for onboard DRAM size in GB (expect roughly 1GB per 1TB NAND), reject HMB, and demand high-resolution photos of both PCB faces — a DRAM package is visible or it is not there.
    • FIRMWARE-ONLY 'PLP'. Sellers claim power loss protection with no capacitors. RFQ defence: ask for capacitor type and count and have them pointed out in the board photo; ask for JESD218 power-cycling test results. Real hardware PLP is physically countable.
    • M.2 2280 'WITH PLP'. 80mm boards rarely have room for a real capacitor bank; 22110 exists precisely because 110mm does. A 2280 PLP claim needs a board photo before it is believed.
    • THE NEARLINE HDD 'MANUFACTURER'. No PRC company manufactures hard disk drives. Only Seagate, Western Digital and Toshiba do. Any Chinese seller describing itself as the factory for 20-32TB nearline drives is a trader, relabeller or refurbisher. RFQ defence: ask for the OEM part number and an authorisation letter or upstream purchase invoice, and state in the question that you know no PRC manufacturer exists.
  • 2U tool-less ball-bearing slide rail kit2U免工具滚珠滑轨套件
    White spaceHS 8473.30per setCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • 3.5in 12/16-bay SAS/SATA backplane12盘位 SAS/SATA 背板
    White spaceHS 8473.30per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • REFURBISHED DRIVES WITH RESET SMART. The 2025 Seagate scandal saw drives with tens of thousands of hours sold as new after SMART counters were zeroed. RFQ defence: demand `smartctl -l farm` output (smartmontools 7.4+) on 3 random units — Seagate FARM (Field Accessible Reliability Metrics) records Power-on Hours and Head Flight Hours independently and is not resettable by the tools fraudsters use. A FARM/SMART mismatch is proof, not suspicion.
    • THE POWER-CYCLE TELL. Even without FARM, a reset drive gives itself away: 2 power-on hours against 2,400 power cycles is impossible for a genuinely new drive. Always ask for power-on hours AND power cycle count AND Percentage Used together — resetters usually zero one field and forget the others.
    • COUNTERFEIT CAPACITY. SSD firmware is modified to report far more capacity than the physical NAND holds; the drive writes normally until it wraps and silently corrupts. RFQ defence: require a full-span write-then-verify test (h2testw or `badblocks -w`) on a sample, plus the flash-ID readout showing die count and per-die capacity.
    • DRAM-LESS CONTROLLERS SOLD AS ENTERPRISE. Especially in M.2 2280 and cheap U.2. RFQ defence: ask for onboard DRAM size in GB (expect roughly 1GB per 1TB NAND), reject HMB, and demand high-resolution photos of both PCB faces — a DRAM package is visible or it is not there.
    • FIRMWARE-ONLY 'PLP'. Sellers claim power loss protection with no capacitors. RFQ defence: ask for capacitor type and count and have them pointed out in the board photo; ask for JESD218 power-cycling test results. Real hardware PLP is physically countable.
    • M.2 2280 'WITH PLP'. 80mm boards rarely have room for a real capacitor bank; 22110 exists precisely because 110mm does. A 2280 PLP claim needs a board photo before it is believed.
    • THE NEARLINE HDD 'MANUFACTURER'. No PRC company manufactures hard disk drives. Only Seagate, Western Digital and Toshiba do. Any Chinese seller describing itself as the factory for 20-32TB nearline drives is a trader, relabeller or refurbisher. RFQ defence: ask for the OEM part number and an authorisation letter or upstream purchase invoice, and state in the question that you know no PRC manufacturer exists.
  • 400G QSFP-DD/OSFP DAC and breakout400G 高速铜缆及拆分线
    White spaceHS 8544.42per pcCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • 42U/48U 600mm or 800mm server rack cabinet42U/48U 600/800mm 服务器机柜
    White spaceHS 9403.20per cabinetCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Assuming 'not US-origin' means 'not subject to the EAR'. The Advanced Computing FDPR at 734.9(h) captures foreign-produced 3A090/4A090/.z items made with listed US technology or software, or on a plant derived from it. That covers essentially all leading-edge logic on earth. De minimis analysis never even begins for an FDPR-captured item.
    • Assuming a Chinese trading company can lawfully resell a controlled accelerator abroad. It cannot: 742.6(b)(10)(iii) is presumption of denial for all reexports and for D:5/Macau-headquartered entities, and License Exception ACA at 740.8 expressly excludes entities headquartered in — or ultimately parented in — D:5 or Macau. There is no structure that fixes this.
    • Reading the January 2026 case-by-case rule as 'H200 is now sellable to China'. It permits a LICENSED US EXPORTER to apply, with four certifications including a 50%-of-US-volume cap and mandatory independent US-lab pre-export verification. It changed nothing about reexport from China, and left presumption of denial fully intact for D:5/Macau-headquartered buyers.
    • Believing the AI Diffusion Rule was rescinded and its machinery is gone. It was never rescinded in the Federal Register: 740.27 (AIA), 740.28 (ACM), 740.29 (LPP), Supplement 5 to Part 740 and the 790,000,000 TPP country allocations are all still codified at 2026-09-01. BIS announced non-enforcement of its NEW requirements in May 2025, but the 2026-05-31 guidance confirms the pre-existing November-2023 headquarters-based licence requirement IS enforced, and the 2026-06-17 FAQ extends it to .z items.
    • Treating the Affiliates Rule as dead. It is STAYED, not repealed — 2025-19846 stays the 2025-09-30 IFR until 2026-11-09, roughly two months from now. Build the 50%-ownership aggregation logic now behind a flag. Note also that FDPR footnote 5 already carries its own surviving 50%-ownership provision, and OFAC's own 50% Rule never went away.
    • Screening the brand instead of the legal entity. Entity List designations are entity-specific: 'Inspur (Beijing) Electronic Information Industry' is listed while other Inspur group companies are not, and several distinct Fudan Microelectronics entities were listed separately in September 2025. Screen the unified social credit code on the contract, plus every alias.
    • Ignoring alias sprawl. The September 2025 additions show entities with up to sixteen aliases, and the four NetForward / Nanfei entities were listed across four cities. A single-string name match will miss most of them.
  • 4U 102-bay top-load JBOD4U 102盘位 JBOD
    White spaceHS 8473.30per unitCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • REFURBISHED DRIVES WITH RESET SMART. The 2025 Seagate scandal saw drives with tens of thousands of hours sold as new after SMART counters were zeroed. RFQ defence: demand `smartctl -l farm` output (smartmontools 7.4+) on 3 random units — Seagate FARM (Field Accessible Reliability Metrics) records Power-on Hours and Head Flight Hours independently and is not resettable by the tools fraudsters use. A FARM/SMART mismatch is proof, not suspicion.
    • THE POWER-CYCLE TELL. Even without FARM, a reset drive gives itself away: 2 power-on hours against 2,400 power cycles is impossible for a genuinely new drive. Always ask for power-on hours AND power cycle count AND Percentage Used together — resetters usually zero one field and forget the others.
    • COUNTERFEIT CAPACITY. SSD firmware is modified to report far more capacity than the physical NAND holds; the drive writes normally until it wraps and silently corrupts. RFQ defence: require a full-span write-then-verify test (h2testw or `badblocks -w`) on a sample, plus the flash-ID readout showing die count and per-die capacity.
    • DRAM-LESS CONTROLLERS SOLD AS ENTERPRISE. Especially in M.2 2280 and cheap U.2. RFQ defence: ask for onboard DRAM size in GB (expect roughly 1GB per 1TB NAND), reject HMB, and demand high-resolution photos of both PCB faces — a DRAM package is visible or it is not there.
    • FIRMWARE-ONLY 'PLP'. Sellers claim power loss protection with no capacitors. RFQ defence: ask for capacitor type and count and have them pointed out in the board photo; ask for JESD218 power-cycling test results. Real hardware PLP is physically countable.
    • M.2 2280 'WITH PLP'. 80mm boards rarely have room for a real capacitor bank; 22110 exists precisely because 110mm does. A 2280 PLP claim needs a board photo before it is believed.
    • THE NEARLINE HDD 'MANUFACTURER'. No PRC company manufactures hard disk drives. Only Seagate, Western Digital and Toshiba do. Any Chinese seller describing itself as the factory for 20-32TB nearline drives is a trader, relabeller or refurbisher. RFQ defence: ask for the OEM part number and an authorisation letter or upstream purchase invoice, and state in the question that you know no PRC manufacturer exists.
  • 4U 24/36-bay front-load JBOD4U 24/36盘位 JBOD
    White spaceHS 8473.30per unitCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • REFURBISHED DRIVES WITH RESET SMART. The 2025 Seagate scandal saw drives with tens of thousands of hours sold as new after SMART counters were zeroed. RFQ defence: demand `smartctl -l farm` output (smartmontools 7.4+) on 3 random units — Seagate FARM (Field Accessible Reliability Metrics) records Power-on Hours and Head Flight Hours independently and is not resettable by the tools fraudsters use. A FARM/SMART mismatch is proof, not suspicion.
    • THE POWER-CYCLE TELL. Even without FARM, a reset drive gives itself away: 2 power-on hours against 2,400 power cycles is impossible for a genuinely new drive. Always ask for power-on hours AND power cycle count AND Percentage Used together — resetters usually zero one field and forget the others.
    • COUNTERFEIT CAPACITY. SSD firmware is modified to report far more capacity than the physical NAND holds; the drive writes normally until it wraps and silently corrupts. RFQ defence: require a full-span write-then-verify test (h2testw or `badblocks -w`) on a sample, plus the flash-ID readout showing die count and per-die capacity.
    • DRAM-LESS CONTROLLERS SOLD AS ENTERPRISE. Especially in M.2 2280 and cheap U.2. RFQ defence: ask for onboard DRAM size in GB (expect roughly 1GB per 1TB NAND), reject HMB, and demand high-resolution photos of both PCB faces — a DRAM package is visible or it is not there.
    • FIRMWARE-ONLY 'PLP'. Sellers claim power loss protection with no capacitors. RFQ defence: ask for capacitor type and count and have them pointed out in the board photo; ask for JESD218 power-cycling test results. Real hardware PLP is physically countable.
    • M.2 2280 'WITH PLP'. 80mm boards rarely have room for a real capacitor bank; 22110 exists precisely because 110mm does. A 2280 PLP claim needs a board photo before it is believed.
    • THE NEARLINE HDD 'MANUFACTURER'. No PRC company manufactures hard disk drives. Only Seagate, Western Digital and Toshiba do. Any Chinese seller describing itself as the factory for 20-32TB nearline drives is a trader, relabeller or refurbisher. RFQ defence: ask for the OEM part number and an authorisation letter or upstream purchase invoice, and state in the question that you know no PRC manufacturer exists.
  • 4U 60-bay / 90-bay high-density storage server4U 60/90盘位高密度存储服务器
    White spaceHS 8471.50per unitCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • NEARLINE HDD: there is no such thing as a Chinese nearline HDD manufacturer. The world has exactly three producers — Seagate, Western Digital and Toshiba. Seagate's Wuxi plant is the only foreign HDD assembly site in China and it is Seagate's own. Any PRC counterparty presenting itself as an HDD 'factory' is a distributor, a broker or a relabeller. Buy through the three producers' authorised channel and reconcile every serial number against the producer's own warranty database.
    • REFURBISHED AND RECERTIFIED DRIVES SOLD AS NEW. The dominant HDD fraud in the Shenzhen channel is OEM-pull or recertified drives with SMART power-on-hours reset and relabelled cases. Require SMART attribute dumps (power-on hours, power cycles, reallocated sectors) at incoming inspection on a sampled basis, plus original sealed anti-static packaging and matching carton lot codes.
    • LTO TAPE IS THE SECOND NO-PRC-MANUFACTURER POSITION. Tape drive mechanisms come from IBM; media from Fujifilm and Sony. A Chinese 'tape library manufacturer' is an integrator. Apply the same reasoning as HDD.
    • 'ARM SERVER' AMBIGUITY. A Chinese quote for an ARM server very often means Kunpeng (Huawei HiSilicon) or Phytium — both Entity Listed — not Ampere. Force the exact CPU part number into the RFQ and reject quotes that describe the CPU only as 'domestic ARM' or 'ARM 64-core'.
    • 'BARE SWITCH CHASSIS' MEANS TWO DIFFERENT THINGS. Sometimes it means a complete, ASIC-populated whitebox switch shipped with ONIE and no network OS — still a switch for HS and for encryption purposes. Sometimes it means an empty sheet-metal enclosure with PSU and fan bays and no switching board — a part. The price gap is roughly an order of magnitude and the customs treatment differs. Never accept the phrase without a BOM.
    • REBADGING ACROSS THE ENTITY LIST BOUNDARY. Machines built by listed vendors circulate under unlisted third-party brands, and unlisted brands sometimes subcontract to listed manufacturers. Require the manufacturer's legal entity name and factory address on the commercial invoice and the certificate of origin, not just a brand.
    • NAND PROVENANCE INSIDE ENTERPRISE SSD. A PRC-built enterprise SSD may be assembled by an unlisted company using YMTC NAND, and YMTC has been Entity Listed since December 2022. Ask for the NAND die vendor and the controller vendor by name for every SSD SKU.
  • 4U 60-bay top-load JBOD enclosure4U 60盘位 JBOD 存储扩展柜
    White spaceHS 8473.30per unitCN supply: strong
    unrestricted
    5 questions ready5 of them decide comparabilitysee the question set →
    7 ways buyers get burned here
    • REFURBISHED DRIVES WITH RESET SMART. The 2025 Seagate scandal saw drives with tens of thousands of hours sold as new after SMART counters were zeroed. RFQ defence: demand `smartctl -l farm` output (smartmontools 7.4+) on 3 random units — Seagate FARM (Field Accessible Reliability Metrics) records Power-on Hours and Head Flight Hours independently and is not resettable by the tools fraudsters use. A FARM/SMART mismatch is proof, not suspicion.
    • THE POWER-CYCLE TELL. Even without FARM, a reset drive gives itself away: 2 power-on hours against 2,400 power cycles is impossible for a genuinely new drive. Always ask for power-on hours AND power cycle count AND Percentage Used together — resetters usually zero one field and forget the others.
    • COUNTERFEIT CAPACITY. SSD firmware is modified to report far more capacity than the physical NAND holds; the drive writes normally until it wraps and silently corrupts. RFQ defence: require a full-span write-then-verify test (h2testw or `badblocks -w`) on a sample, plus the flash-ID readout showing die count and per-die capacity.
    • DRAM-LESS CONTROLLERS SOLD AS ENTERPRISE. Especially in M.2 2280 and cheap U.2. RFQ defence: ask for onboard DRAM size in GB (expect roughly 1GB per 1TB NAND), reject HMB, and demand high-resolution photos of both PCB faces — a DRAM package is visible or it is not there.
    • FIRMWARE-ONLY 'PLP'. Sellers claim power loss protection with no capacitors. RFQ defence: ask for capacitor type and count and have them pointed out in the board photo; ask for JESD218 power-cycling test results. Real hardware PLP is physically countable.
    • M.2 2280 'WITH PLP'. 80mm boards rarely have room for a real capacitor bank; 22110 exists precisely because 110mm does. A 2280 PLP claim needs a board photo before it is believed.
    • THE NEARLINE HDD 'MANUFACTURER'. No PRC company manufactures hard disk drives. Only Seagate, Western Digital and Toshiba do. Any Chinese seller describing itself as the factory for 20-32TB nearline drives is a trader, relabeller or refurbisher. RFQ defence: ask for the OEM part number and an authorisation letter or upstream purchase invoice, and state in the question that you know no PRC manufacturer exists.
  • 52U / 48U tall rack48U/52U加高机柜
    White spaceHS 9403.20per unitCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • 800G OSFP DAC (224G/lane class)800G OSFP 无源铜缆 (224G单通道)
    White spaceHS 8544.42per pcCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • Active copper cable (ACC) 400G/800G400G/800G 有源铜缆 ACC
    White spaceHS 8544.42per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • Active electrical cable (AEC) 400G/800G400G/800G 有源电缆 AEC
    White spaceHS 8544.42per pcCN supply: moderate
    classify first

    AEC is patent-contested territory (Credo and Amphenol settled cross-claims in 2025) — confirm your supplier's licence position

    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • Active optical cable (AOC) 100G/400G/800G有源光缆 AOC
    White spaceHS 8544.70per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • Adjustable pedestal (understructure)活动地板支座
    White spaceHS 7308.90per pieceCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Adjustable server rail kit / rail extension可调服务器滑轨/延长件
    White spaceper pairCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    9 questions ready7 of them decide comparabilitysee the question set →
    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Air dam / rack side-gap seal kit机柜挡风板/侧封条
    White spaceHS 3926.90per kitCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Air dam / rail-gap sealing kit机柜立柱侧封条/挡风组件
    White spaceper setCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • All-steel raised floor panel全钢防静电活动地板
    White spaceHS 7308.90per panel / m²CN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Aluminium containment framing profile and connectors封闭通道铝型材及连接件
    White spaceHS 7610.90per m / setCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Aluminium honeycomb raised floor panel铝合金蜂窝防静电地板
    White spaceHS 7610.90per panel / m²CN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Aluminium ladder rack / running rack铝合金走线架
    White spaceHS 7610.90per mCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Anti-tip stabiliser / baying / seismic anchor kit机柜防倾倒底脚/并柜件/抗震固定件
    White spaceHS 7326.90per kitCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Anti-tip stabiliser kit and seismic base anchor机柜防倾倒支架与抗震底座
    White spaceHS 7326.90per kitCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Depth is quoted without the bezel, ears, CMA or rear cable bend radius. A '798 mm' 2U server needs roughly 950-1000 mm of usable rack depth once mounted and cabled - which is why full-depth AI nodes do not belong in 1000 mm racks. Always ask for front-post-to-rear clearance, not chassis depth.
    • Rail kits and CMAs excluded from the system price without saying so. Two 'identical' server quotes can differ by the cost of rails, and the cheaper one arrives unmountable.
    • Rail load rating quoted as the static figure only. The number that matters is the rating at full extension. An 8U 130 kg GPU node exceeds ordinary ~38-45 kg kits by roughly 3x, and the failure happens the first time someone slides it out.
    • Physical x16 PCIe slots wired electrically x8, or slots that only exist when an optional riser is purchased. Demand a per-slot map: generation, electrical width, physical width, height and riser dependency.
    • PCIe Gen5 risers and cable kits sold without retimers or without an insertion-loss budget. The link trains at Gen4 or fails intermittently under load. Retimers and redrivers are not interchangeable - only protocol-aware retiming rescues a long channel.
    • Backplane described as '24-bay NVMe' when it is actually expander-attached and shares a fraction of the bandwidth. Direct-attach vs expander is the single largest hidden performance and price variable in storage servers.
    • CRPS / CRPS2 / M-CRPS power supplies that fit the same bay but use different pinouts. The PSU seats perfectly and the system will not power on.
  • Asset barcode label (polyester / laser-etched)资产条码标签
    White spaceHS 4821.10per pc/rollCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Bare DC-grade ISO container shell, 20ft / 40ft / 40HQ, CSC-plated数据中心用集装箱空箱体（带CSC安全合格牌）
    White spaceHS 9406.20 / 9406.20.00 / 7326 / 7308contestedper unitCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Cooling sized at 25 °C, not at your real ambient. Chinese vendors habitually publish nominal cooling capacity at benign conditions. A DX in-row unit rated 40 kW at 35 °C outdoor may deliver 26–30 kW at 48 °C in the Gulf, and its condenser may trip on high pressure entirely. Demand the capacity table at YOUR site design ambient (dry bulb and wet bulb, 0.4% ASHRAE annual percentile), and make the derated figure the contractual number.
    • 'IP55' that is IP55 only on the shell. Aipu-Waton's own literature confirms IP65 is a customisation, not a default. Louvres, cable entries, condenser openings and door seals are where ingress actually happens. In sandstorm or coastal environments specify the filtration class (G4/F7), the coating system (C5-M per ISO 12944 for marine), and require an ingress test report on the assembled unit, not a component certificate.
    • No UL 2755 certification for a North American destination. UL 2755:2025 is the Outline of Investigation that US and Canadian AHJs now reference for prefabricated modular data centre systems. Almost no Chinese factory holds it as standard, and obtaining it retrospectively means factory inspection plus rework. Ask for the certificate number and the certifying body (UL Solutions, Intertek or CSA) before, not after, the PO.
    • Component CE certificates presented as an assembly CE mark. There is no unitary CE mark for a modular data centre. What is required is a technical file combining LVD, EMC, Machinery Directive (for moving parts), pressure equipment (for the cooling circuit), and construction product evidence for the enclosure, plus a Declaration of Conformity naming the assembly. A folder of supplier CE certificates for the UPS and the AC unit is not that.
    • Standards mismatch that voids your local design code. GB 50174-2017 explicitly excludes outdoor container-based facilities from its scope. If a supplier cites GB 50174 compliance for a container product, they are citing the wrong standard — the applicable Chinese document is GB/T 36448-2018, with GB/T 1413 and GB/T 5338 for the box itself. Neither maps cleanly onto EN 50600 or the Uptime Institute Tier system, and a container is very hard to certify as Tier III concurrently maintainable.
    • Rated payload exceeded, silently. A 40HQ has a rated payload around 26–28 t. A fully fitted 40ft data centre with racks, UPS, batteries, transformer and a filled liquid loop routinely exceeds it. The unit then cannot be stowed as ordinary FCL, cannot be lifted by standard terminal equipment, and cannot legally travel on many roads. Get the weight certificate — dry, and wet-and-populated — in writing before booking freight.
    • Out-of-gauge cargo discovered after signing. Anything wider than 2438 mm or taller than 2896 mm is out-of-gauge: flat-rack or breakbulk stowage, special handling, route survey, escorts and permits. Huawei's FusionDC1000B core module at 3600 mm high is already in this category. On difficult inland routes the freight and permit cost can approach the module price. Establish the transport envelope before the technical spec is frozen.
  • Blanking panel / airflow management panel盲板/挡风板
    White spaceHS 7326.90 / 3926.90contestedper pieceCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Depth is quoted without the bezel, ears, CMA or rear cable bend radius. A '798 mm' 2U server needs roughly 950-1000 mm of usable rack depth once mounted and cabled - which is why full-depth AI nodes do not belong in 1000 mm racks. Always ask for front-post-to-rear clearance, not chassis depth.
    • Rail kits and CMAs excluded from the system price without saying so. Two 'identical' server quotes can differ by the cost of rails, and the cheaper one arrives unmountable.
    • Rail load rating quoted as the static figure only. The number that matters is the rating at full extension. An 8U 130 kg GPU node exceeds ordinary ~38-45 kg kits by roughly 3x, and the failure happens the first time someone slides it out.
    • Physical x16 PCIe slots wired electrically x8, or slots that only exist when an optional riser is purchased. Demand a per-slot map: generation, electrical width, physical width, height and riser dependency.
    • PCIe Gen5 risers and cable kits sold without retimers or without an insertion-loss budget. The link trains at Gen4 or fails intermittently under load. Retimers and redrivers are not interchangeable - only protocol-aware retiming rescues a long channel.
    • Backplane described as '24-bay NVMe' when it is actually expander-attached and shares a fraction of the bandwidth. Direct-attach vs expander is the single largest hidden performance and price variable in storage servers.
    • CRPS / CRPS2 / M-CRPS power supplies that fit the same bay but use different pinouts. The PSU seats perfectly and the system will not power on.
  • Blanking panel, metal 1U/2U/4U金属盲板
    White spaceHS 7326.90per pieceCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Blanking panels, brush grommets and airflow seals盲板、毛刷理线孔与风道封堵件
    White spaceHS 7326.90 / 3926.90contestedper pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Transceiver vendor lock is a software problem sold as a hardware problem. The compatibility code sits in the module's EEPROM and is read over I2C by the switch, which compares it before bringing the port up. Chinese factories will burn whatever code you name — so 'is this Cisco compatible' is the wrong question; 'can you code each unit to our exact switch model list and bench-verify' is the right one. Quotes without a coding answer are not comparable.
    • The same trap applies at both ends of every DAC, ACC, AEC and AOC — each end carries its own EEPROM. A cable between a Cisco leaf and an H3C spine needs asymmetric coding, which most buyers never specify and most quotes never mention.
    • The .z sweep makes visual inspection worthless for compliance. BIS created .z paragraphs in 3A001.z, 4A003.z, 4A004.z, 4A005.z, 5A002.z, 5A004.z, 5A992.z, 5D002.z and 5D992.z that capture items purely because they incorporate an IC meeting 3A090/4A090 parameters. Two identical-looking 800G switches, or two SmartNICs in the same chassis, can sit on opposite sides of a licence requirement. Only the internal ASIC/DSP part number resolves it, so the ECCN question must be a hard RFQ field, not a footnote.
    • Lane structure is invisible in a part number and fatal in deployment. An 800G module can be 8x100G or 4x200G; a 400G can be 8x50G (QSFP-DD) or 4x100G (QSFP112). If the lane structure does not match the switch SerDes generation, the link never trains and both parties blame the other's hardware.
    • MPO-12 versus MPO-16 quietly invalidates entire cable plants. 800G DR8 needs MPO-16; most existing trunking is MPO-12. Combine that with UPC-versus-APC end-face and polarity method A/B/C and you have three independent ways to buy a fibre plant that physically connects and optically fails.
    • OSFP flat-top versus finned-top, and OSFP versus OSFP-RHS, are mechanical fit decisions inside the switch cage. Ordering the wrong heatsink profile means modules that will not seat in a switch you have already bought.
    • Passive DAC reach collapses as lane rate rises. What worked at 3-5m at 25G/lane is roughly 2m at 100G/lane. Buyers reuse an old length survey, order passive DAC, and discover mid-install that half the runs need ACC or AEC at several times the price and with an added export-classification question.
  • Blanking panels, brush grommets and floor seals盲板 / 毛刷密封 / 地板密封件
    White spaceHS 3926.90per pcCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • The 'manufacturer' that is a trading company. On Alibaba and Made-in-China this is the default state for racks, containment, rack PDUs, cabling and small cooling accessories. The distinguishing evidence: (a) 经营范围 in the business licence says 销售/贸易 but not 生产; (b) the 'factory address' equals the registered office and is in an office tower, not an industrial park; (c) no 生产许可 or product certification is held in the seller's own name — certificates show a different company; (d) they are not in any CIOE/China Refrigeration/CDCC exhibitor list; (e) they quote across five unrelated categories. Always cross-check the 统一社会信用代码 on gsxt.gov.cn.
    • The reverse trap: assuming a trader is always bad. For a 20-line mixed BOM, a competent Guangdong trading company is often the only party that will handle consolidation, export documentation and one invoice. The trap is paying manufacturer margins for trader service, or letting the trader hide who actually made the goods so warranty has no counterparty.
    • Cooling capacity quoted at undeclared conditions. A '100 kW' CRAH at 15/21C chilled water is a different machine from a '100 kW' CRAH at 12/18C, and a '35 kW' passive rear door at 12C water is not the same product as one at 18C. Chinese quotes routinely omit the conditions and Western buyers routinely compare the headline number.
    • CDU kW ratings with only one loop temperature. A CDU is defined by primary in, primary out, secondary in, secondary out and both flow rates. A single number is not a specification and cannot be compared across vendors.
    • Residual air heat in liquid-cooled racks. Vendors state '90% heat captured to liquid' and buyers size the room for 10%. In practice the uncaptured fraction is often 15-25% under real workloads, and a 120 kW rack then dumps 25 kW into a hall designed for 12. Ask for kW of residual air heat per chassis, in writing.
    • Filled floor loading for immersion tanks. A filled immersion tank can exceed 2,000 kg/m2. Chinese quotes give the dry weight. The building, not the tank, is what fails.
    • Aluminium substituted for copper in busbar, busway and switchgear. It is legal, it meets the current rating, and it is not what the buyer priced. Specify conductor material and cross-section, and weigh a sample on arrival.
  • Blanking panels, brush grommets, floor grommets盲板、毛刷密封圈、地板密封
    White spaceHS 3926.90per pcsCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Capacity quoted without an approach temperature. This is the single biggest trap in CDU sourcing. A CDU rated '800 kW' at a 5 K approach may deliver only 500-550 kW at the 3 K approach your design actually needs. Two quotes are not comparable until both state the approach.
    • Air-cooling capacity quoted at a 35C return-air temperature. Chinese precision-AC datasheets commonly use a warmer return condition than Western practice, which inflates the sensible kW by 20-30%. Always restate the capacity at your own hall condition.
    • Sensible versus total cooling capacity. A total-cooling number includes latent capacity you will never use in a data centre. Insist on sensible-only.
    • Pump curves given on water at 20C when the fluid is 25% glycol at 45C. The viscosity penalty is real and vendors rarely volunteer the corrected curve. Your flow will be short and nobody will know why until commissioning.
    • 'Supports Modbus' with no register map supplied. This is near-universal among Chinese CDU vendors and it strands the DCIM integration for months. Make the documented register map, BACnet object list and SNMP MIB explicit PO deliverables with payment tied to them.
    • Filter micron ratings quoted as nominal, not absolute. A 50-micron nominal filter passes particles that block a 0.3 mm microchannel cold plate. Specify absolute and demand the beta ratio.
    • Coolant sold as concentrate and diluted on site with local tap water. This destroys the inhibitor package, introduces chlorides and hardness, and is the most common root cause of first-year corrosion in Chinese liquid-cooling installations. Buy premixed with DI water, in sealed IBCs.
  • Blanking panel, tool-less plastic (snap-in)免工具塑料盲板
    White spaceHS 3926.90per pieceCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Blind-mate liquid-cooled cabinet盲插液冷机柜
    White spaceper unitCN supply: moderate
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Brush grommet cable entry panel毛刷板/走线毛刷
    White spaceHS 8473.30per pcCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Brush grommet / floor cable seal, 100x300 mm and larger毛刷式理线孔盖/地板密封
    White spaceHS 3926.90per pieceCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Filter class fraud: media sold as ePM1 55% (F7) that tests at coarse-filter performance. Demand the ISO 16890 report number, the accredited laboratory and the report date, and spot-test media from the delivered lot — not from the sample.
    • Nominal versus actual filter dimensions: a filter quoted as 600x600 that measures 592x592 against a frame expecting 595x595 leaks unfiltered air around the element and voids the rated efficiency entirely. Always specify actual mm and tolerance.
    • Buying filters on unit price instead of Eurovent energy class: a filter 30 Pa higher in initial pressure drop can cost more in fan energy over one service life than the entire unit price difference. Compare kWh/yr at 0.944 m3/s, then price.
    • PTM7950 and high-end TIM counterfeits: this is the single most counterfeited item in the data-centre consumable catalogue. Relabelled generic phase-change film is endemic on Chinese marketplaces. Buy only via authorised distribution with lot traceability, and verify storage conditions in transit.
    • Coolant supplied as industrial glycol cut with tap water rather than certified DI water, with no inhibitor package. Conductivity on arrival is the tell — test every drum against a stated uS/cm limit and reject on the number, not on the label.
    • Automotive or HVAC inhibited coolant sold as data-centre coolant: silicates and borates drop out and foul cold-plate microchannels months later. Require a written silicate-free, borate-free, nitrite-free, amine-free declaration.
    • Fitting a mixed-bed DI polishing cartridge to an inhibited PG25 loop: the resin strips the inhibitor package out of the fluid and corrosion begins silently. Common and expensive design error, usually made by whoever specified the CDU rather than the fluid.
  • Brush grommet, floor cut-out地板走线毛刷密封件
    White spaceHS 3926.90per pieceCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Brush-strip cable entry panel and rear cable comb毛刷理线板与后部理线梳
    White spaceHS 7326.90 / 3926.90contestedper pieceCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Depth is quoted without the bezel, ears, CMA or rear cable bend radius. A '798 mm' 2U server needs roughly 950-1000 mm of usable rack depth once mounted and cabled - which is why full-depth AI nodes do not belong in 1000 mm racks. Always ask for front-post-to-rear clearance, not chassis depth.
    • Rail kits and CMAs excluded from the system price without saying so. Two 'identical' server quotes can differ by the cost of rails, and the cheaper one arrives unmountable.
    • Rail load rating quoted as the static figure only. The number that matters is the rating at full extension. An 8U 130 kg GPU node exceeds ordinary ~38-45 kg kits by roughly 3x, and the failure happens the first time someone slides it out.
    • Physical x16 PCIe slots wired electrically x8, or slots that only exist when an optional riser is purchased. Demand a per-slot map: generation, electrical width, physical width, height and riser dependency.
    • PCIe Gen5 risers and cable kits sold without retimers or without an insertion-loss budget. The link trains at Gen4 or fails intermittently under load. Retimers and redrivers are not interchangeable - only protocol-aware retiming rescues a long channel.
    • Backplane described as '24-bay NVMe' when it is actually expander-attached and shares a fraction of the bandwidth. Direct-attach vs expander is the single largest hidden performance and price variable in storage servers.
    • CRPS / CRPS2 / M-CRPS power supplies that fit the same bay but use different pinouts. The PSU seats perfectly and the system will not power on.
  • Cabinet-level electronic lock (smart handle lock)机柜电子锁 / 智能门锁
    White spaceHS 8301.40 / 8543.70contestedper pc / cabinetCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Cabinet lock controller / bus concentrator机柜锁控制器 / 集中控制器
    White spaceHS 8543.70per unitCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • The aspirating detector is quoted without the pipe-network hydraulic calculation. The unit is a commodity; the calculation is the product. Without a calculation showing transport time and per-hole sensitivity for YOUR hall geometry, you have bought a box that will alarm late or never. Make the calculation a pre-shipment deliverable, and re-run it if the pipe route changes on site.
    • ASD sampling pipe bought separately at a different internal diameter than the calculation assumed. This silently invalidates the transport-time result. Buy pipe and detector as one scope, or state the design ID in the pipe RFQ.
    • Point smoke detectors specified as primary detection in a high-airflow hall. At 40-60+ air changes per hour smoke is diluted below the detector threshold. Point detectors are the cross-zone confirmation layer for gas release. If the Chinese design shows only point detection in the main hall, the design is wrong for the airflow, regardless of how many detectors are drawn.
    • Ceiling-only ASD sampling. In a hot-aisle-contained hall with high air change rates the smoke goes to the return air path. Three-level sampling (ceiling, return air duct, under-floor or in-cabinet) is the arrangement that actually detects. In-duct sampling is the level most often value-engineered out.
    • Gas suppression quoted without an over-pressure relief vent area calculation, and without a room integrity (door fan) test. Undersized vents damage the room structure on discharge; a leaky room loses the agent long before the 10-minute hold time. Both are cheap and both are routinely absent from Chinese scope.
    • IG-541 quoted at attractive unit price without the buyer noticing it needs 8-12x the cylinder-room floor area of an HFC-227ea system, plus 15-30 MPa pipework and supports. The cylinder room area is a building design decision that must be made before the RFQ, not discovered after award.
    • Pre-action valve quoted as single interlock when the requirement is double interlock. The word 'pre-action' alone does not specify it. Single interlock admits water on a detection event alone. Write 'double interlock (detection AND sprinkler operation)' in the specification.
  • Cable and port label kit (wrap / heat-shrink)线缆标签/热缩标识套件
    White spaceHS 4821.10per kitCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Cable ladder, tray and containment, hot-dip galvanised电缆桥架 / 梯式桥架 (热镀锌)
    White spaceHS 7308.90per metre + fittingsCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • kVA quoted where kW is meant. A 500 kVA UPS at 0.9 output power factor delivers 450 kW. Chinese modular UPS is now usually unity-PF, but older platforms and cheap bids are not, and the 10% gap is invisible until commissioning. Always demand both numbers and the output PF.
    • Battery quoted in ampere-hours. UPS batteries are sized in watts per cell at a specified end voltage for a specified time, because data centre autonomies are short and high-rate. An Ah figure tells you almost nothing about whether the string will hold the load for 10 minutes. A supplier who quotes only Ah either does not understand UPS duty or is hoping you do not.
    • Autonomy quoted at nameplate, not at end of life or at the real ambient. Ten minutes at a new battery at 25 C can be six or seven minutes at end of warranty in a 35 C battery room. Specify the sizing conditions in the RFQ.
    • Transformer losses that fail EU Ecodesign Tier 2. The standard Chinese SCB13 dry-type is a fine transformer that in many ratings simply cannot be legally placed on the EU market under Regulation (EU) 548/2014 as amended by 2019/1783. Buyers discover this after the letter of credit is open. Ask for guaranteed watt figures, not a class name, and check them against the regulation before ordering.
    • SF6 ring main units quoted into the EU. The F-gas Regulation (EU) 2024/573 restricts new SF6 MV switchgear placed on the EU market. A Chinese supplier's default RMU is SF6. The SF6-free alternative exists but Chinese depth in it is much thinner and the type-test evidence is often a family read-across rather than a test of the quoted model.
    • Genset emission tier assumed transferable. India's CPCB IV+ has applied to DG sets since July 2023 and disqualifies most Chinese-packaged engines outright. EU Stage V and US EPA Tier 4 are separate hurdles again. An engine certified for the Chinese domestic non-road standard is not installable in these markets, and no amount of documentation fixes it after shipment. This is the single most expensive mistake in the category.
    • Busway quoted without a common routing drawing. Straight lengths are the cheap, easy-to-compare part. Elbows, tees, offsets, expansion joints, fire barriers, end feeds and hangers frequently exceed the cost of the straights and vary enormously between bidders reading the same layout differently. Issue one routing drawing revision and require an itemised bill of fittings against it, or the tender is theatre.
  • Cable lugs, compression connectors and crimping dies接线端子 / 铜鼻子 及 压接模具
    White spaceHS 8536.90per pieceCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • kVA quoted where kW is meant. A 500 kVA UPS at 0.9 output power factor delivers 450 kW. Chinese modular UPS is now usually unity-PF, but older platforms and cheap bids are not, and the 10% gap is invisible until commissioning. Always demand both numbers and the output PF.
    • Battery quoted in ampere-hours. UPS batteries are sized in watts per cell at a specified end voltage for a specified time, because data centre autonomies are short and high-rate. An Ah figure tells you almost nothing about whether the string will hold the load for 10 minutes. A supplier who quotes only Ah either does not understand UPS duty or is hoping you do not.
    • Autonomy quoted at nameplate, not at end of life or at the real ambient. Ten minutes at a new battery at 25 C can be six or seven minutes at end of warranty in a 35 C battery room. Specify the sizing conditions in the RFQ.
    • Transformer losses that fail EU Ecodesign Tier 2. The standard Chinese SCB13 dry-type is a fine transformer that in many ratings simply cannot be legally placed on the EU market under Regulation (EU) 548/2014 as amended by 2019/1783. Buyers discover this after the letter of credit is open. Ask for guaranteed watt figures, not a class name, and check them against the regulation before ordering.
    • SF6 ring main units quoted into the EU. The F-gas Regulation (EU) 2024/573 restricts new SF6 MV switchgear placed on the EU market. A Chinese supplier's default RMU is SF6. The SF6-free alternative exists but Chinese depth in it is much thinner and the type-test evidence is often a family read-across rather than a test of the quoted model.
    • Genset emission tier assumed transferable. India's CPCB IV+ has applied to DG sets since July 2023 and disqualifies most Chinese-packaged engines outright. EU Stage V and US EPA Tier 4 are separate hurdles again. An engine certified for the Chinese domestic non-road standard is not installable in these markets, and no amount of documentation fixes it after shipment. This is the single most expensive mistake in the category.
    • Busway quoted without a common routing drawing. Straight lengths are the cheap, easy-to-compare part. Elbows, tees, offsets, expansion joints, fire barriers, end feeds and hangers frequently exceed the cost of the straights and vary enormously between bidders reading the same layout differently. Issue one routing drawing revision and require an itemised bill of fittings against it, or the tender is theatre.
  • Cable management arm (CMA)理线臂
    White spaceper pieceCN supply: strong
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    1 question ready1 of them decide comparabilitysee the question set →
    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Cable management arm (CMA) 1U/2U1U/2U理线臂
    White spaceHS 8473.30per pcCN supply: strong
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Cable tie / hook-and-loop / lacing kit魔术贴扎带/理线扎带套件
    White spaceHS 3926.90per roll/bagCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Cable tray, ladder and trunking system with supports电缆桥架 (托盘式/梯式/槽式) 及支吊架系统
    White spaceHS 7308.90per metre plus fittingsCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • kVA quoted where kW is meant. A 500 kVA UPS at 0.9 output power factor delivers 450 kW. Chinese modular UPS is now usually unity-PF, but older platforms and cheap bids are not, and the 10% gap is invisible until commissioning. Always demand both numbers and the output PF.
    • Battery quoted in ampere-hours. UPS batteries are sized in watts per cell at a specified end voltage for a specified time, because data centre autonomies are short and high-rate. An Ah figure tells you almost nothing about whether the string will hold the load for 10 minutes. A supplier who quotes only Ah either does not understand UPS duty or is hoping you do not.
    • Autonomy quoted at nameplate, not at end of life or at the real ambient. Ten minutes at a new battery at 25 C can be six or seven minutes at end of warranty in a 35 C battery room. Specify the sizing conditions in the RFQ.
    • Transformer losses that fail EU Ecodesign Tier 2. The standard Chinese SCB13 dry-type is a fine transformer that in many ratings simply cannot be legally placed on the EU market under Regulation (EU) 548/2014 as amended by 2019/1783. Buyers discover this after the letter of credit is open. Ask for guaranteed watt figures, not a class name, and check them against the regulation before ordering.
    • SF6 ring main units quoted into the EU. The F-gas Regulation (EU) 2024/573 restricts new SF6 MV switchgear placed on the EU market. A Chinese supplier's default RMU is SF6. The SF6-free alternative exists but Chinese depth in it is much thinner and the type-test evidence is often a family read-across rather than a test of the quoted model.
    • Genset emission tier assumed transferable. India's CPCB IV+ has applied to DG sets since July 2023 and disqualifies most Chinese-packaged engines outright. EU Stage V and US EPA Tier 4 are separate hurdles again. An engine certified for the Chinese domestic non-road standard is not installable in these markets, and no amount of documentation fixes it after shipment. This is the single most expensive mistake in the category.
    • Busway quoted without a common routing drawing. Straight lengths are the cheap, easy-to-compare part. Elbows, tees, offsets, expansion joints, fire barriers, end feeds and hangers frequently exceed the cost of the straights and vary enormously between bidders reading the same layout differently. Issue one routing drawing revision and require an itemised bill of fittings against it, or the tender is theatre.
  • Cable tray, ladder rack and overhead containment steelwork电缆桥架 / 梯式桥架 / 上走线架
    White spaceHS 7308.90contestedper m + fittingsCN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • The 'manufacturer' that is a trading company. On Alibaba and Made-in-China this is the default state for racks, containment, rack PDUs, cabling and small cooling accessories. The distinguishing evidence: (a) 经营范围 in the business licence says 销售/贸易 but not 生产; (b) the 'factory address' equals the registered office and is in an office tower, not an industrial park; (c) no 生产许可 or product certification is held in the seller's own name — certificates show a different company; (d) they are not in any CIOE/China Refrigeration/CDCC exhibitor list; (e) they quote across five unrelated categories. Always cross-check the 统一社会信用代码 on gsxt.gov.cn.
    • The reverse trap: assuming a trader is always bad. For a 20-line mixed BOM, a competent Guangdong trading company is often the only party that will handle consolidation, export documentation and one invoice. The trap is paying manufacturer margins for trader service, or letting the trader hide who actually made the goods so warranty has no counterparty.
    • Cooling capacity quoted at undeclared conditions. A '100 kW' CRAH at 15/21C chilled water is a different machine from a '100 kW' CRAH at 12/18C, and a '35 kW' passive rear door at 12C water is not the same product as one at 18C. Chinese quotes routinely omit the conditions and Western buyers routinely compare the headline number.
    • CDU kW ratings with only one loop temperature. A CDU is defined by primary in, primary out, secondary in, secondary out and both flow rates. A single number is not a specification and cannot be compared across vendors.
    • Residual air heat in liquid-cooled racks. Vendors state '90% heat captured to liquid' and buyers size the room for 10%. In practice the uncaptured fraction is often 15-25% under real workloads, and a 120 kW rack then dumps 25 kW into a hall designed for 12. Ask for kW of residual air heat per chassis, in writing.
    • Filled floor loading for immersion tanks. A filled immersion tank can exceed 2,000 kg/m2. Chinese quotes give the dry weight. The building, not the tank, is what fails.
    • Aluminium substituted for copper in busbar, busway and switchgear. It is legal, it meets the current rating, and it is not what the buyer priced. Specify conductor material and cross-section, and weigh a sample on arrival.
  • Cable tray sheet thickness by width (JB/T 10216)桥架板厚（按宽度）
    White spaceper specificationCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Cage nut and screw kit, M6 / M5, zinc or black, with plastic washers机柜方螺母螺丝套装 M6/M5
    White spaceHS 7318.16 / 7318.15contestedper pack (50/100)CN supply: dominant
    unrestricted
    7 ways buyers get burned here
    • Filter class fraud: media sold as ePM1 55% (F7) that tests at coarse-filter performance. Demand the ISO 16890 report number, the accredited laboratory and the report date, and spot-test media from the delivered lot — not from the sample.
    • Nominal versus actual filter dimensions: a filter quoted as 600x600 that measures 592x592 against a frame expecting 595x595 leaks unfiltered air around the element and voids the rated efficiency entirely. Always specify actual mm and tolerance.
    • Buying filters on unit price instead of Eurovent energy class: a filter 30 Pa higher in initial pressure drop can cost more in fan energy over one service life than the entire unit price difference. Compare kWh/yr at 0.944 m3/s, then price.
    • PTM7950 and high-end TIM counterfeits: this is the single most counterfeited item in the data-centre consumable catalogue. Relabelled generic phase-change film is endemic on Chinese marketplaces. Buy only via authorised distribution with lot traceability, and verify storage conditions in transit.
    • Coolant supplied as industrial glycol cut with tap water rather than certified DI water, with no inhibitor package. Conductivity on arrival is the tell — test every drum against a stated uS/cm limit and reject on the number, not on the label.
    • Automotive or HVAC inhibited coolant sold as data-centre coolant: silicates and borates drop out and foul cold-plate microchannels months later. Require a written silicate-free, borate-free, nitrite-free, amine-free declaration.
    • Fitting a mixed-bed DI polishing cartridge to an inhibited PG25 loop: the resin strips the inhibitor package out of the fluid and corrosion begins silently. Common and expensive design error, usually made by whoever specified the CDU rather than the fluid.
  • Cage nut, screw and washer kit (M6)方孔螺母（笼式螺母）套装
    White spaceHS 7318.16per packCN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
  • Cage nut + screw + washer hardware kit卡式螺母/方孔螺母+螺钉套件
    White spaceHS 7318.16per bag/1000pcsCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • Integration scope left as one word. 'Integrated rack' can mean an upright, cabled, tested rack or a cabinet on a pallet with the servers in cartons beside it. Force a line-by-line yes/no on racking, cabling, labelling, config, firmware alignment and rack-level test, and pin the L-level (L6/L10/L11/L12).
    • Missing rails. Rails are chassis-specific and rack-specific. A quote that lists servers but no rail part number will arrive with no way to mount them. Ask for the rail PN, the post type, the mounting depth range and the load rating, and demand the chassis side-hole drawing.
    • CMA and rail quoted as one item, delivered as one item. Cable management arms are almost never included by default. Same for the adapter bracket needed on round-hole or threaded racks.
    • Rails not rated for loaded shipment. A rail rated 38kg static is not necessarily rated to ship with a server in it. If the rack ships upright, the rail rating and the shipping rating are two different questions.
    • 'Metered PDU' covering four different products. Inlet metering, per-bank metering and per-outlet metering are sold under the same phrase. Without the accuracy class (IEC 62053-21 Class 1 = ±1%) the numbers cannot be used for chargeback.
    • PDU physically will not fit. 0U PDU body length versus the rack's clear internal height, and PDU depth versus cable bend radius behind the servers. Ask for body length in mm, not just '0U'.
    • Wrong input plug for the destination. Chinese factories default to CN or generic plugs. The input plug standard, cord length and the destination's certification (UL vs CE vs CCC) must be stated per shipment.
  • Cage nuts, M6/M5 screw kit and rail hardware方孔螺母与螺丝套件
    White spaceHS 7318.16per kitCN supply: moderate
    unrestricted
    7 ways buyers get burned here
    • 'OEM' means the opposite of what you think. A Chinese seller saying OEM almost always means 代工/贴牌 — they will build or relabel to your spec, with no brand IP behind it. A Western buyer hears 'made by Dell/HPE'. Never accept the word; ask which factory designed the board and which built it, and get FCC ID / CMIIT ID and PCB silkscreen photos.
    • Engineering samples sold as production silicon. ES/QS CPUs are typically 30-50% below retail, carry no vendor warranty, and can be unstable in specific workloads. Intel states the S-spec is printed only on the IHS, that 'Intel Confidential' or a missing brand string identifies an ES, and that it may retain or destroy re-marked product. QS is nearer retail but is still a sample. Demand IHS photos and an ES/QS exclusion clause with lot-level return.
    • 拆机件 sold as new. Decommissioned DDR4 RDIMMs, RAID cards and drives are a huge, largely legitimate market — the fraud is the relabelling. Refurbishers are documented as resurfacing bad sectors, zeroing power-on hours and swapping model labels. Require original sealed packaging, single-lot date codes, and per-unit health logs.
    • SMART is not proof of a new drive. Commercial tools reset SMART attributes to factory defaults in one click. On Seagate drives the FARM log is a second, harder-to-scrub record: FARM hours exceeding SMART hours indicates tampering. On SSDs, firmware can misreport capacity and health outright, so a clean SMART page means very little.
    • Altered labels defeat verification portals. Scammers copy serials from newer drives onto old units and reprint QR codes so that vendor verification appears to pass. Verify serials yourself at the OEM portal (verify.seagate.com, cway.cisco.com/sncheck, Intel's FPO/ATPO lookup), and cross-check that the serial's warranty start date is consistent with a genuinely new unit.
    • Remarked memory. A DDR5-4800 module relabelled as 6400, or SK hynix dies under a Samsung label, is caught only by comparing three layers: printed module label, SPD dump, and the die markings on the chips themselves. Any disagreement across those three is disqualifying.
    • Vendor-locked parts that boot nowhere. AMD PSB-locked EPYCs, crossflashed RAID cards and OEM-keyed drives are common in pulled stock and are functionally worthless outside their original platform. Ask about lock status explicitly; a seller who does not understand the question is a reseller, not a builder.
  • Calcium sulphate raised floor panel硫酸钙防静电地板
    White spaceHS 6809.19per panel / m²CN supply: dominant
    unrestricted

    Control status not established per item; treated as ordinary goods because the item class carries no integrated circuit that the .z paragraphs would reach. Verify before a first shipment.

    7 ways buyers get burned here
    • OEM vs fabricator vs trader. Three tiers exist and they quote the same product. Integrator-OEMs (Huawei, Envicool, KSTAR, Kehua, Yimikang, ZTE, Inspur) own the thermal/fire/electrical integration and warrant the system. True rack OEMs (Keydak, Toten, MERO-TSK) own tooling, a brand and a catalogue. Below them sit hundreds of Hebei/Ningbo/Foshan sheet-metal shops and export trading houses that will print any logo. A legal name containing 进出口 / Imp. & Exp. is a trading company. Ask for the plant address, the business licence scope, and a video walk of the powder-coat line — not a catalogue.
    • Static vs dynamic load quoted interchangeably. Chinese datasheets frequently show only 静载 (static). Dynamic (rolling, loaded) rating is typically about half — Inspur's ISC-NR42 is 2450 kg static / 1250 kg dynamic. If a rack quotes '2000 kg' with no qualifier, assume it is static and that you cannot roll it loaded.
    • PVC fibre raceway sold as ABS. Optical trunking (光纤槽道) is specified in ABS or PC/ABS because PVC releases chlorine over time and heavily above about 60 °C. Chinese carriers require ABS; substitution to cheaper PVC is common and invisible on delivery. Require a material certificate and a burn/FTIR test on an incoming sample.
    • '沈飞' raised-floor branding is a fragmented family, not a company. Dozens of independent regional entities trade as 沈飞地板 (Chongqing, Zhuhai, Guangzhou, Shenzhen and others) with no common specification, tooling or QA. Buying '沈飞' does not identify a manufacturer. Specify the legal entity and the plant, and test-certify each source separately.
    • Fire linkage left out of the containment scope. A sealed aisle is normally only permitted where the roof drops away or auto-opens on the fire alarm: electromagnets hold flaps closed, release on power loss, open within ~3 s, with openable area typically ≥60% of aisle plan area. Fabricators quoting a containment kit routinely omit the dry-contact interface and the hold-open magnets. Put the fire-linkage interface in the containment supplier's scope and make it a named line item.
    • Gas suppression and a sealed roof are incompatible unless the roof releases. Where the room uses total-flooding gas, the controller must shut dampers and stop air handlers before discharge (GB 50174-2017). A fixed non-releasing containment roof both blocks agent distribution and traps it. Fixed glass roofs are only sourceable for rooms on sprinkler/pre-action with heads correctly located.
    • Seismic bracing omitted from cable tray and busway. GB 50981-2014 makes seismic support mandatory (clauses 1.0.4, 5.1.4, 7.4.6) at intensity 6 and above, for cable tray and busway above roughly 150 N/m and electrical conduit ≥60 mm ID. Importers buying tray on price routinely leave the bracing out, then discover it at inspection. Price bracing per hanger point with the tray, not after.
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