aluminum heat sinks passive cooling: pure copper C110, 0.5 mm fins at 1.5 mm pitch, 0.10 mm over 100 mm flatness, 1.10 K/W thermal resistance. MOQ 500 pcs, s...
aluminum heat sinks passive cooling: pure copper C110, 0.5 mm fins at 1.5 mm pitch, 0.10 mm over 100 mm flatness, 1.10 K/W thermal resistance. MOQ 500 pcs, s...
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Aluminum heat sinks passive cooling from BQUQ use a one-piece stamped design with a 3.0 mm base and 0.5 mm fins at 1.5 mm pitch, pressed from pure copper C110 on 250 T tooling. They hold 0.10 mm flatness over 100 mm and deliver 1.10 K/W at ΔT = 75 K with 2.0 m/s forced air. Monthly capacity is 50,000 pcs.
Aluminum heat sinks passive cooling from BQUQ use a one-piece stamped design with a 3.0 mm base and 0.5 mm fins at 1.5 mm pitch, pressed from pure copper C110 on 250 T tooling. They hold 0.10 mm flatness over 100 mm and deliver 1.10 K/W at ΔT = 75 K with 2.0 m/s forced air. Monthly capacity is 50,000 pcs.
A 3.0 mm base and 0.5 mm fins define this aluminum heat sinks passive cooling. Pressed from pure copper C110 on 250 T tooling, it holds 0.10 mm over 100 mm and returns 1.10 K/W at ΔT = 75 K, forced air 2.0 m/s. Monthly output runs at 50,000 pcs.
Because the base and fins are pressed as one piece, there is no brazed joint to fail. 0.10 mm over 100 mm flatness on the mounting face is held directly from the tool, which keeps thermal interface contact uniform.
Low fin gauge is where stamping wins: 0.5 mm fins at 1.5 mm pitch give more surface per cubic millimetre than a machined or extruded profile of the same envelope.
The one-piece geometry removes the adhesive layer found in two-part coolers, cutting the thermal path. Nothing sits between pure copper C110 and the airflow except the stamped surface itself.
Stamped construction tolerates batch variation better than extrusion: die wear shows up first as a measurable shift in fin pitch, which inspection catches at CMM 0.001 mm resolution rather than in the field.
Related reading: How Should You Size and Mount a Heat Sink for Raspberry Pi and SBCs?.
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.
The standard material is pure copper C110, supplied with hard anodize Type III, 25-40 µm. For applications where EV and OBC charger 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 ±0.20 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 ±0.10 mm. Tighter classes need an extra press operation, so it is worth deciding before tooling rather than after.
See also: Auto Lathe Collets: Types, Sizes and What the Type Numbers Mean.
Incoming pure copper C110 is checked for thickness and hardness before it enters the press. After forming, CMM 0.001 mm resolution confirms 0.10 mm over 100 mm and 1.5 mm against the drawing.
Sampling is AQL 0.65 for critical dimensions and 1.5 for general, with CMM 0.001 mm resolution on every first article. Deviations beyond ±0.20 mm trigger a full-lot sort.
Flatness is measured on granite rather than on cast iron, because 0.10 mm over 100 mm at 20 x 20 x 10 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.
Learn more about What Is CNC Machining Lead Time and How Can You Shorten It?.
In EV and OBC charger, the 1.10 K/W rating determines how much airflow the enclosure still needs. At EV and OBC charger junction temperatures, 0.5 mm fins at 1.5 mm pitch keep the delta-T inside the sensor budget.
EV and OBC charger programs are the reason this geometry exists. Where the enclosure cannot grow taller, fin density is the only lever, and 1.5 mm pitch with 0.5 mm stock is the practical ceiling for aluminium.
Where a aluminum heat sinks passive cooling runs at EV and OBC charger volumes, part-to-part consistency decides field returns. ±0.05 mm on a 50,000 pcs run keeps the thermal curve inside one band.
For EV and OBC charger prototypes, 5 working days covers drawing review and first article. Production lots move to 20 working days once the ±0.05 mm capability is signed off.
| Parameter | Value / Range |
|---|---|
| Material | pure copper C110 |
| Fin thickness | 0.5 mm |
| Fin pitch | 1.5 mm |
| Fin height | 50 mm |
| Base thickness | 3.0 mm |
| Base flatness | 0.10 mm over 100 mm |
| Thermal resistance | 1.10 K/W |
| Thermal test condition | ΔT = 75 K, forced air 2.0 m/s |
| Surface finish | hard anodize Type III, 25-40 µm |
| Size range | 20 x 20 x 10 mm |
Every lot is inspected with CMM 0.001 mm resolution, and the report is included in the shipment. We check 0.10 mm over 100 mm, 1.5 mm, 3.0 mm and hole position against ±0.20 mm. Lot traceability from coil to carton is kept for 10 years.
pure copper C110 is the standard choice. For EV and OBC charger in a corrosive environment we specify 6063-T5 with hard anodize Type III, 25-40 µm; for the highest conductivity we move to copper C110, which raises cost and weight but drops thermal resistance by roughly half at the same envelope.
Further technical detail: Precision CNC Machined Clutch Transmission Parts.
0.10 mm over 100 mm measured on granite surface plate, 25 °C. This is the number that matters for EV and OBC charger, because the thermal pad needs even contact. If your assembly needs better, say so and we can add a skim operation.
Recommended reading: Custom Spring Ordering: The 7 Critical Specifications You Must Provide.
On pure copper C110 at normal press tonnage, expect a tooling life of roughly . At 50,000 pcs that is 6 to 12 months. We keep spare die sets on site for EV and OBC charger programs, which removes the wait if wear shows up in the flatness record.
Compare it with BQUQ Pin Fin Precision Machined Heatsink Collection.
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 50,000 pcs. For EV and OBC charger in a fixed-height enclosure, stamped is normally the right answer.
Source-direct from Dongguan: coil stock, forming, surface treatment and inspection happen in one building, so 0.10 mm over 100 mm flatness is verified before the part is packed.
Our EV and OBC charger experience runs back to the first tooling programme in 2015. That history is why the standard hard anodize Type III, 25-40 µm and ±0.20 mm are conservative rather than optimistic.
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.
Request a quote: sc@bquq.com | WhatsApp +86 13713157787 | Dongguan, China
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See also: Spring Manufacturing Tolerances: Standards You Should Know.
| Parameter | Value / Range |
|---|---|
| Material | Pure copper C110 |
| Tolerance | 0.10 mm over 100 mm flatness; CMM 0.001 mm resolution |
| Lead time | Standard for this process: 2–4 weeks after tooling approval |
| MOQ | Standard for this process: 5,000 pcs |
| Capacity | 50,000 pcs per month |
| Option | Best for | Trade-off |
|---|---|---|
| Stamped one-piece copper C110 | High-volume passive cooling with low fin gauge | Requires 250 T tooling; die wear shifts fin pitch |
| Machined profile | Low-volume or complex geometries | Higher cost per part; less surface per cubic millimetre |
| Extruded profile | Simple constant cross-sections | Cannot match 0.5 mm fins at 1.5 mm pitch; batch variation less detectable |
| Two-part cooler with adhesive | Mixed-material assemblies | Adhesive layer adds thermal resistance and a joint that can fail |
| Stage | Control | Record |
|---|---|---|
| Stamping | 250 T tooling presses base and fins as one piece | Tool setup sheet and first-article inspection |
| Flatness | 0.10 mm over 100 mm on mounting face held from tool | CMM report at 0.001 mm resolution |
| Fin pitch | 1.5 mm pitch monitored for die wear shift | Inspection log with measured pitch values |
| Surface finish | Hard anodize Type III, 25–40 µm applied after forming | Coating thickness certificate |
| Final inspection | Inspection before every shipment | Shipment inspection record |
It returns 1.10 K/W at ΔT = 75 K with forced air at 2.0 m/s. The one-piece stamped copper C110 construction removes the adhesive layer found in two-part coolers, cutting the thermal path. Flatness of 0.10 mm over 100 mm keeps thermal interface contact uniform.
The part is pressed from pure copper C110. Copper offers higher thermal conductivity than aluminum, and the 250 T stamping process forms the 3.0 mm base and 0.5 mm fins as one piece. Hard anodize Type III, 25–40 µm is applied after forming for corrosion protection.
Learn more about Aluminum heat sink.
Fins are 0.5 mm gauge at 1.5 mm pitch, with a 3.0 mm base. This low fin gauge gives more surface per cubic millimetre than a machined or extruded profile of the same envelope. Die wear shows up first as a measurable shift in fin pitch, caught by CMM at 0.001 mm resolution.
Further technical detail: Why Do Heat Sinks Have Fins? Fin Spacing Explained for Optimal Thermal Performance.
We hold 0.10 mm over 100 mm flatness on the mounting face directly from the tool. Inspection uses CMM at 0.001 mm resolution. This keeps thermal interface contact uniform and catches any die wear shift in fin pitch before shipment.
Monthly output runs at 50,000 pcs. Standard MOQ for this stamped process is 5,000 pcs, and lead time is typically 2–4 weeks after tooling approval. Capacity scales with the 250 T tooling and one-piece stamped construction.
Recommended reading: OEM extruded heat sink service.
Hard anodize Type III, 25–40 µm is applied after forming, so corrosion protection does not get cut through at the fin roots the way it does when coating precedes forming. This preserves the stamped surface between pure copper C110 and the airflow.
Stamped construction tolerates batch variation better than extrusion. Die wear shows up first as a measurable shift in fin pitch, which inspection catches at CMM 0.001 mm resolution rather than in the field. It also achieves 0.5 mm fins at 1.5 mm pitch for more surface per cubic millimetre.
| Parameter | Value / Range |
|---|---|
| Material | Pure copper C110 |
| Tolerance | 0.10 mm flatness over 100 mm |
| Lead time | Standard for this process |
| MOQ | Standard for this process |
| Capacity | 50,000 pcs per month |
| Option | Best for | Trade-off |
|---|---|---|
| One-piece stamped | High volume, low thermal resistance | Limited to thin fin gauges |
| Brazed assembly | Complex geometries | Joint may fail, added thermal resistance |
| Extruded profile | Simple shapes, low tooling cost | Lower surface area per volume |
| Machined profile | Prototypes, tight tolerances | Higher cost, slower production |
It delivers 1.10 K/W at ΔT = 75 K with 2.0 m/s forced air. The one-piece stamped design from pure copper C110 ensures uniform contact and no brazed joint, maintaining performance over 50,000 pcs monthly capacity.
The base is 3.0 mm thick, and fins are 0.5 mm thick at 1.5 mm pitch. This geometry maximizes surface area per cubic millimetre, pressed on 250 T tooling for consistent flatness of 0.10 mm over 100 mm.
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Pure copper C110 is used for its high thermal conductivity. The one-piece stamped construction eliminates adhesive layers, ensuring the thermal path is direct from the base to the fins, with no brazed joint to fail.
Flatness is held to 0.10 mm over 100 mm on the mounting face. This is achieved directly from the tool, ensuring uniform thermal interface contact and consistent performance across all 50,000 pcs monthly production.
Monthly capacity is 50,000 pcs. The 250 T tooling and one-piece stamped process allow high-volume output while maintaining 0.10 mm flatness and 1.10 K/W thermal resistance at ΔT = 75 K with 2.0 m/s forced air.
No, the base and fins are pressed as one piece, eliminating brazed joints. This removes the adhesive layer found in two-part coolers, cutting the thermal path and improving reliability for passive cooling applications.
The rated 1.10 K/W is at ΔT = 75 K with 2.0 m/s forced air. For passive cooling, natural convection may yield higher thermal resistance, but the one-piece copper C110 design still provides efficient heat dissipation.
| Parameter | Specification |
|---|---|
| Material | pure copper C110 |
| Fin thickness | 0.5 mm |
| Fin pitch | 1.5 mm |
| Fin height | 50 mm |
| Base thickness | 3.0 mm |
| Base flatness | 0.10 mm over 100 mm |
| Thermal resistance | 1.10 K/W |
| Surface finish | hard anodize Type III, 25-40 µm |
| Monthly capacity | 50,000 pcs |
| MOQ (prototype) | 500 pcs |
| Lead time (production) | 20 working days |
| Size range | 20 x 20 x 10 mm |
