aluminum heat sink extrusion: 1050A aluminium, 0.3 mm fins at 5.0 mm pitch, 0.05 mm over 100 mm flatness, 0.35 K/W thermal resistance. MOQ 100 pcs, ships in ...
aluminum heat sink extrusion: 1050A aluminium, 0.3 mm fins at 5.0 mm pitch, 0.05 mm over 100 mm flatness, 0.35 K/W thermal resistance. MOQ 100 pcs, ships in ...
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Aluminum heat sink extrusion in 1050A aluminium delivers 0.35 K/W thermal resistance under ΔT = 75 K with forced air at 2.0 m/s. Fins are 0.3 mm thick at 5.0 mm pitch over a 1.5 mm base, and flatness is held to 0.05 mm over 100 mm. A single 63 T stroke forms the one-piece profile, with tooling at ±0.03 mm and an 18 s cycle feeding a 120,000 pcs line.
A aluminum heat sink extrusion in 1050A aluminium delivers 0.35 K/W thermal resistance under ΔT = 75 K, forced air 2.0 m/s. Fins are 0.3 mm thick at 5.0 mm pitch over a 1.5 mm base, and every batch ships with a CMM report at CMM plus granite flatness plate.
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.
A single 63 T stroke forms the whole aluminum heat sink extrusion, so part cost stops scaling with complexity. Tooling runs ±0.03 mm, and the 18 s cycle feeds a 120,000 pcs line.
The one-piece geometry removes the adhesive layer found in two-part coolers, cutting the thermal path. Nothing sits between 1050A aluminium and the airflow except the stamped surface itself.
Pressing 1050A aluminium keeps the aluminum heat sink extrusion light, from 650 g depending on envelope, without sacrificing fin density, which matters where airflow path length is already fixed by the enclosure.
The clear anodize Type II, 5-10 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.
The standard material is 1050A aluminium, supplied with clear anodize Type II, 5-10 µm. For applications where telecom and base station 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 ±0.03 mm, and hole position is held to ±0.10 mm. Tighter classes need an extra press operation, so it is worth deciding before tooling rather than after.
Each batch carries a CMM report from CMM plus granite flatness plate. We record flatness, pitch, base thickness and hole position, and flag anything outside ±0.15 mm before it leaves the line.
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Incoming 1050A aluminium is checked for thickness and hardness before it enters the press. After forming, CMM plus granite flatness plate confirms 0.05 mm over 100 mm and 5.0 mm against the drawing.
Sampling is AQL 0.65 for critical dimensions and 1.5 for general, with CMM plus granite flatness plate on every first article. Deviations beyond ±0.15 mm trigger a full-lot sort.
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We inspect 0.3 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.
In telecom and base station, the base usually doubles as the mounting interface. 1.5 mm with 0.05 mm over 100 mm flat gives a stable surface for the telecom and base station thermal pad.
Designers working on telecom and base station ask for flatness before they ask for thermal data, because telecom and base station assembly is automated and a non-flat base stops the line.
telecom and base station designs often run a 2.0 m/s forced-air path. 0.35 K/W at ΔT = 75 K, forced air 2.0 m/s means telecom and base station can hold its target with fan power below the acoustic limit.
For telecom and base station prototypes, 7 working days covers drawing review and first article. Production lots move to 20 working days once the ±0.03 mm capability is signed off.
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| Parameter | Value / Range |
|---|---|
| Material | 1050A aluminium |
| Fin thickness | 0.3 mm |
| Fin pitch | 5.0 mm |
| Fin height | 10 mm |
| Base thickness | 1.5 mm |
| Base flatness | 0.05 mm over 100 mm |
| Thermal resistance | 0.35 K/W |
| Thermal test condition | ΔT = 75 K, forced air 2.0 m/s |
| Surface finish | clear anodize Type II, 5-10 µm |
| Size range | 120 x 80 x 50 mm |
Yes. Send a drawing or a sample and we return a DFM note within 3 working days. Most telecom and base station customisations change 5.0 mm, 1.5 mm or the hole pattern, and all three are tooling changes on the existing 63 T press rather than a new machine.
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 ±0.03 mm. If your drawing needs tighter, tell us before tooling so we can plan the extra press operation.
Yes. Standard is clear anodize Type II, 5-10 µm. Powder coating to RAL 9005 adds about 0.1 mm to the base; zinc-nickel is better for grounding. Note that any added coating sits between 1050A aluminium and the airflow, so we do not coat the fin roots.
The family covers 120 x 80 x 50 mm, with unit weights from 650 g. Because the base is pressed, new sizes are a die insert change rather than a new press line, so development is usually 2 weeks rather than 8.
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.
Source-direct from Dongguan: coil stock, forming, surface treatment and inspection happen in one building, so 0.05 mm over 100 mm flatness is verified before the part is packed.
Further technical detail: How to Calculate Heat Sink Size for Your Electronic Enclosure.
Our telecom and base station experience runs back to the first tooling programme in 2015. That history is why the standard clear anodize Type II, 5-10 µm and ±0.15 mm are conservative rather than optimistic.
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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.
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Request a quote: sc@bquq.com | WhatsApp +86 13713157787 | Dongguan, China
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| Parameter | Value / Range |
|---|---|
| Material | 1050A aluminium |
| Tolerance | ±0.03 mm tooling; 0.05 mm over 100 mm flatness |
| Lead time | Standard for this process: 2–4 weeks after tooling approval |
| MOQ | Standard for this process: 1,000 pcs |
| Capacity | 120,000 pcs line at 18 s cycle |
| Option | Best for | Trade-off |
|---|---|---|
| Extruded one-piece heat sink | High-volume, low-cost, no joint failure | Limited to constant cross-section profiles |
| Brazed or bonded two-part cooler | Complex geometries with varying fin heights | Adhesive layer adds thermal resistance and can fail |
| 1050A aluminium | Lightweight, good thermal conductivity, anodizable | Lower strength than 6061 or 6063 alloys |
| Clear anodize Type II, 5–10 µm | Corrosion protection after forming | Thin coating; not for abrasive environments |
| Natural convection | Low-noise, low-power applications | Higher thermal resistance than forced air |
| Stage | Control | Record |
|---|---|---|
| Extrusion | Single 63 T stroke forms base and fins as one piece | Tooling runs ±0.03 mm |
| Flatness | 0.05 mm over 100 mm on mounting face held from tool | CMM report plus granite flatness plate |
| Surface finish | Clear anodize Type II, 5–10 µm applied after forming | Visual and coating thickness check |
| Inspection | CMM report before every shipment | Batch-specific CMM data |
| Shipping | Every batch ships with CMM report | Packaging and label per order |
It delivers 0.35 K/W under ΔT = 75 K with forced air at 2.0 m/s. That performance comes from a one-piece 1050A aluminium profile with 0.3 mm fins at 5.0 mm pitch over a 1.5 mm base, and 0.05 mm over 100 mm flatness for uniform thermal interface contact.
See also: Thermal Resistance in Heat Sinks: How to Read and Apply the Specs.
We use 1050A aluminium because it keeps the extrusion light, from 650 g depending on envelope, without sacrificing fin density. It also anodizes well for the clear anodize Type II, 5–10 µm finish applied after forming, so corrosion protection is not cut through.
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Tooling runs ±0.03 mm, and we hold 0.05 mm over 100 mm flatness on the mounting face directly from the tool. This keeps thermal interface contact uniform. Every batch ships with a CMM report measured on a CMM plus granite flatness plate.
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A single 63 T stroke forms the whole aluminum heat sink extrusion, so the base and fins are one piece with no brazed joint. The 18 s cycle feeds a 120,000 pcs line, and part cost stops scaling with complexity once tooling is made.
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Standard lead time for this process is 2–4 weeks after tooling approval, and the MOQ is 1,000 pcs. Capacity is 120,000 pcs on the line at an 18 s cycle, so we can support both pilot runs and volume production.
The standard finish is clear anodize Type II, 5–10 µm, applied after forming. This provides corrosion protection without cutting through the coating. Other finishes may be available on request, but the anodize is the baseline for this extrusion.
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It is used in enclosures where airflow path length is already fixed and weight matters. The one-piece geometry removes the adhesive layer found in two-part coolers, cutting the thermal path. Typical applications include electronics cooling, LED thermal management, and power supply heat sinks.
| Parameter | Specification |
|---|---|
| Material | 1050A aluminium |
| Fin thickness | 0.3 mm |
| Fin pitch | 5.0 mm |
| Fin height | 10 mm |
| Base thickness | 1.5 mm |
| Base flatness | 0.05 mm over 100 mm |
| Thermal resistance | 0.35 K/W |
| Surface finish | clear anodize Type II, 5-10 µm |
| Monthly capacity | 120,000 pcs |
| MOQ (prototype) | 100 pcs |
| Lead time (production) | 20 working days |
| Size range | 120 x 80 x 50 mm |
