aluminum heat sink hs code: 6061-T6 aluminium, 0.5 mm fins at 2.5 mm pitch, 0.05 mm over 100 mm flatness, 0.62 K/W thermal resistance. MOQ 500 pcs, ships in ...
aluminum heat sink hs code: 6061-T6 aluminium, 0.5 mm fins at 2.5 mm pitch, 0.05 mm over 100 mm flatness, 0.62 K/W thermal resistance. MOQ 500 pcs, ships in ...
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An aluminum heat sink HS code typically falls under 7616.99 or 7606/7609 depending on whether it is a pressed finned article or a profile, and this 6061-T6 pressed heat sink is defined by a 2.0 mm base, 0.5 mm fins, 0.05 mm over 100 mm flatness, and 0.62 K/W at ΔT = 60 K. Monthly output reaches 120,000 pcs, with Type III hard anodize at 25-40 µm.
A 2.0 mm base and 0.5 mm fins define this aluminum heat sink hs code. Pressed from 6061-T6 aluminium on 250 T tooling, it holds 0.05 mm over 100 mm and returns 0.62 K/W at ΔT = 60 K, natural convection. Monthly output runs at 120,000 pcs.
Related reading: What Is Driving the Growth of Stamped EMI Shielding Parts?.
Because the base and fins are pressed as one piece, there is no brazed joint to fail. 0.05 mm over 100 mm flatness on the mounting face is held directly from the tool, which keeps thermal interface contact uniform.
One supplier now covers 0.5 mm to 0.5 mm fin gauges from the same 250 T press family, so a thermal redesign is a tooling change rather than a new vendor.
Pressing 6061-T6 aluminium keeps the aluminum heat sink hs code light, from 15 g depending on envelope, without sacrificing fin density, which matters where airflow path length is already fixed by the enclosure.
Every stroke is dimensionally identical, so ±0.15 mm hole position carries across the batch. That is what makes VFD and inverter volume programs repeatable.
The hard anodize Type III, 25-40 µm finish is applied after forming, so corrosion protection does not get cut through at the fin roots the way it does on machined alternatives.
See also: Forged Heat Sinks: Manufacturing Process, Performance Data, and Cost Analysis.
The standard material is 6061-T6 aluminium, supplied with hard anodize Type III, 25-40 µm. For applications where VFD and inverter exposure is a concern, we recommend the passivated route; where conductivity matters more than weight, copper C110 raises thermal performance and roughly doubles unit mass.
General dimensions run to ±0.15 mm, with critical features such as ±0.03 mm on fin pitch held separately. Formed geometry inherits tooling repeatability of ±0.05 mm, and hole position is held to ±0.15 mm. Tighter classes need an extra press operation, so it is worth deciding before tooling rather than after.
Flatness is checked on a granite surface plate, 20 °C against a 0.05 mm over 100 mm limit, and fin pitch is verified optically at ±0.05 mm. Reports go out with each lot.
Flatness is measured on granite rather than on cast iron, because 0.05 mm over 100 mm at 40 x 40 x 22 mm reads differently on a plate that has not been lapped. Records keep both readings.
We inspect 0.5 mm fin tips for burr and crack after forming, because stamping can split a root without shifting any drawing dimension. Burr limit is set per part.
Final containment is PE bag + honeycomb carton, 15 kg per carton. Every carton is labelled with lot, quantity and inspection status, and the record is kept for 10 years against the ISO9001 file.
Learn more about Springback Compensation in Metal Stamping: Design & Simulation Guide.
VFD and inverter programs are the reason this geometry exists. Where the enclosure cannot grow taller, fin density is the only lever, and 2.5 mm pitch with 0.5 mm stock is the practical ceiling for aluminium.
VFD and inverter customers typically specify 6061-T6 aluminium for corrosion reasons and then hold the drawing to ±0.15 mm. The 120,000 pcs line absorbs the volume without a second source.
Further technical detail: Stamping Die Maintenance: Extending Tool Life and Part Consistency.
Where a aluminum heat sink hs code runs at VFD and inverter volumes, part-to-part consistency decides field returns. ±0.05 mm on a 120,000 pcs run keeps the thermal curve inside one band.
Recommended reading: CNC Prototyping and Low-Volume Production: When It Makes Sense.
VFD and inverter designs often run a 2.0 m/s forced-air path. 0.62 K/W at ΔT = 60 K, natural convection means VFD and inverter can hold its target with fan power below the acoustic limit.
| Parameter | Value / Range |
|---|---|
| Material | 6061-T6 aluminium |
| Fin thickness | 0.5 mm |
| Fin pitch | 2.5 mm |
| Fin height | 10 mm |
| Base thickness | 2.0 mm |
| Base flatness | 0.05 mm over 100 mm |
| Thermal resistance | 0.62 K/W |
| Thermal test condition | ΔT = 60 K, natural convection |
| Surface finish | hard anodize Type III, 25-40 µm |
| Size range | 40 x 40 x 22 mm |
General dimensions run to ±0.15 mm; critical ones such as ±0.03 mm on fin pitch are held separately. Formed features inherit tooling repeatability of ±0.05 mm. If your drawing needs tighter, tell us before tooling so we can plan the extra press operation.
Extrusion is cheaper above roughly 500,000 pieces per year and gives a smoother profile. Stamping wins below that and wherever fin gauge drops below 0.5 mm, because extrusion cannot hold 0.5 mm consistently. For VFD and inverter prototypes, tooling cost usually decides it.
0.05 mm over 100 mm measured on granite surface plate, 20 °C. This is the number that matters for VFD and inverter, because the thermal pad needs even contact. If your assembly needs better, say so and we can add a skim operation.
We supply a 2D drawing with the CMM report, and 3D STEP on request. Both show flatness callouts and tooling split lines, which matters if you are checking 0.05 mm over 100 mm in your own assembly.
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Skived fins are milled, so you get thin, tall fins and higher density in a given height, but the cost scales directly with fin area. Stamping gives the same result in one stroke at a much lower unit cost below 120,000 pcs. For VFD and inverter in a fixed-height enclosure, stamped is normally the right answer.
Related reading: Custom Heat Sinks with Mounting Base.
The line sits in Dongguan in a single ISO9001 plant. 250 T presses cover the aluminum heat sink hs code family, and 120,000 pcs per month is current committed output.
The factory holds ISO9001 and can ship RoHS and REACH documentation with the PE bag + honeycomb carton, 15 kg per carton. Third-party SGS inspection is arranged on request before the container is sealed.
See also: BQUQ CNC Machined Auto Lathe 36 Type Hex Bore Extended Collet.
Tooling is built in-house, which is how ±0.05 mm is held across a 120,000 pcs programme rather than drifting part by part.
Request a quote: sc@bquq.com | WhatsApp +86 13713157787 | Dongguan, China
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Further technical detail: Precision Machined Pin Fin Heat Sinks.
Recommended reading: Metal heat sink.
| Parameter | Value / Range |
|---|---|
| Material | 6061-T6 aluminium |
| Tolerance | 0.05 mm over 100 mm flatness; ±0.15 mm hole position |
| Lead time | Not stated in excerpt; standard for pressed tooling programs |
| MOQ | Not stated in excerpt; volume programs such as VFD and inverter |
| Capacity | 120,000 pcs per month on 250 T press family |
| Option | Best for | Trade-off |
|---|---|---|
| Pressed one-piece 6061-T6 | VFD and inverter volume programs | Tooling change required for fin gauge redesign |
| Machined alternative | Low-volume or complex geometry | Hard anodize can be cut through at fin roots |
| Brazed joint design | Mixed-material assemblies | Joint can fail under thermal cycling |
| 0.5 mm fin gauge | Fixed airflow path length | Lower fin density than thinner gauges |
| 15 g minimum envelope | Weight-sensitive enclosures | Depends on overall part size |
| Stage | Control | Record |
|---|---|---|
| Pressing | 250 T tooling, one-piece base and fins | Every stroke dimensionally identical |
| Flatness | 0.05 mm over 100 mm on mounting face | Held directly from tool |
| Hole position | ±0.15 mm across batch | Carries across production run |
| Surface finish | Type III hard anodize, 25-40 µm after forming | Corrosion protection at fin roots |
| Thermal performance | 0.62 K/W at ΔT = 60 K, natural convection | Verified before shipment |
Pressed aluminum heat sinks like this 6061-T6 unit typically classify under HS 7616.99 as other articles of aluminum, though exact code depends on finish and profile. The 2.0 mm base, 0.5 mm fins, and 0.62 K/W at ΔT = 60 K performance are the defining technical specs.
We hold 0.05 mm over 100 mm flatness directly from the 250 T tool, which keeps thermal interface contact uniform. Hole position carries at ±0.15 mm across the batch, making VFD and inverter volume programs repeatable at 120,000 pcs per month.
The heat sink is pressed from 6061-T6 aluminium as one piece with no brazed joint. Type III hard anodize at 25-40 µm is applied after forming, so corrosion protection is not cut through at the fin roots like on machined alternatives.
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Thermal resistance is 0.62 K/W at ΔT = 60 K under natural convection. The 2.0 mm base and 0.5 mm fins are pressed as one piece, and 0.05 mm over 100 mm flatness on the mounting face supports uniform thermal interface contact.
Monthly output runs at 120,000 pcs on the 250 T press family. One supplier covers 0.5 mm to 0.5 mm fin gauges from the same press family, so a thermal redesign is a tooling change rather than a new vendor.
Pressing 6061-T6 aluminium keeps the part light, from 15 g depending on envelope, without sacrificing fin density. That matters where airflow path length is already fixed by the enclosure, and it supports the 0.62 K/W at ΔT = 60 K rating.
Because the base and fins are pressed as one piece, there is no brazed joint to fail. The 0.05 mm over 100 mm flatness is held directly from the tool, and every stroke is dimensionally identical, so ±0.15 mm hole position carries across the batch for repeatable VFD and inverter programs.
| Parameter | Specification |
|---|---|
| Material | 6061-T6 aluminium |
| Fin thickness | 0.5 mm |
| Fin pitch | 2.5 mm |
| Fin height | 10 mm |
| Base thickness | 2.0 mm |
| Base flatness | 0.05 mm over 100 mm |
| Thermal resistance | 0.62 K/W |
| Surface finish | hard anodize Type III, 25-40 µm |
| Monthly capacity | 120,000 pcs |
| MOQ (prototype) | 500 pcs |
| Lead time (production) | 20 working days |
| Size range | 40 x 40 x 22 mm |
