aluminum heat sink plate: ADC12 die-cast aluminium, 1.0 mm fins at 1.5 mm pitch, 0.05 mm over 100 mm flatness, 0.35 K/W thermal resistance. MOQ 50 pcs, ships...
aluminum heat sink plate: ADC12 die-cast aluminium, 1.0 mm fins at 1.5 mm pitch, 0.05 mm over 100 mm flatness, 0.35 K/W thermal resistance. MOQ 50 pcs, ships...
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The aluminum heat sink plate uses ADC12 die-cast aluminium with a 1.5 mm fin pitch and 1.0 mm stock, stamped in a single 63 T stroke. It holds 0.05 mm over 100 mm on the mounting face, achieves 0.35 K/W thermal resistance, and maintains ±0.05 mm pitch across a 120,000 pcs run at a 25 s cycle.
The aluminum heat sink plate combines 1.5 mm fin pitch with 1.0 mm stock in ADC12 die-cast aluminium, so 20 x 20 x 10 mm parts keep 0.05 mm over 100 mm on the mounting face. Thermal resistance is 0.35 K/W, measured at CMM 0.001 mm resolution per lot.
Stamping gives a repeatable 1.0 mm fin profile that extrusion cannot hold: the die forms every fin in one stroke, so pitch stays within ±0.05 mm across a 120,000 pcs run.
Related reading: heat sink grease.
A single 63 T stroke forms the whole aluminum heat sink plate, so part cost stops scaling with complexity. Tooling runs ±0.05 mm, and the 25 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 ADC12 die-cast aluminium 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.
See also: Micro Stamping: Real Limits for Parts Under 5 mm.
The sandblast + epoxy powder coating RAL 9005 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 ADC12 die-cast aluminium, supplied with sandblast + epoxy powder coating RAL 9005. 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.
Learn more about What Does CNC Machine Setup Include? Fixturing, Tooling and Programming Explained.
General dimensions run to ±0.15 mm, with critical features such as ±0.05 mm on mounting hole position 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.
Each batch carries a CMM report from CMM 0.001 mm resolution. We record flatness, pitch, base thickness and hole position, and flag anything outside ±0.15 mm before it leaves the line.
Further technical detail: Precision Stamped Automotive Terminals Collection.
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 ±0.15 mm trigger a full-lot sort.
Flatness is measured on granite rather than on cast iron, because 0.05 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.
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 1.0 mm stock is the practical ceiling for aluminium.
For EV and OBC charger builds, the 0.05 mm over 100 mm mounting face matters as much as the thermal rating: it decides whether thermal interface material spreads evenly or pools at one end.
Where a aluminum heat sink plate runs at EV and OBC charger 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: How Many Cycles Will My Spring Last? Fatigue Life Explained for Engineers.
In EV and OBC charger, the base usually doubles as the mounting interface. 1.0 mm with 0.05 mm over 100 mm flat gives a stable surface for the EV and OBC charger thermal pad.
| Parameter | Value / Range |
|---|---|
| Material | ADC12 die-cast aluminium |
| Fin thickness | 1.0 mm |
| Fin pitch | 1.5 mm |
| Fin height | 22 mm |
| Base thickness | 1.0 mm |
| Base flatness | 0.05 mm over 100 mm |
| Thermal resistance | 0.35 K/W |
| Thermal test condition | ΔT = 60 K, natural convection |
| Surface finish | sandblast + epoxy powder coating RAL 9005 |
| Size range | 20 x 20 x 10 mm |
ADC12 die-cast aluminium is the standard choice. For EV and OBC charger in a corrosive environment we specify 6063-T5 with sandblast + epoxy powder coating RAL 9005; 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.
The family covers 20 x 20 x 10 mm, with unit weights from 120 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.
Standard packing is PE bag + honeycomb carton, 15 kg per carton. We quote EXW. Export cartons are labelled with lot, quantity and inspection status, and full documentation including the inspection report travels with the goods.
The key is avoiding a second metal at the wet contact area. We recommend sandblast + epoxy powder coating RAL 9005 and, where the part touches an aluminium chassis, an isolating washer. Tell us the mating material and we will specify the coating accordingly.
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 EV and OBC charger in a fixed-height enclosure, stamped is normally the right answer.
Compare it with Precision Metal Heat Sink by BQUQ.
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.
Our EV and OBC charger experience runs back to the first tooling programme in 2015. That history is why the standard sandblast + epoxy powder coating RAL 9005 and ±0.15 mm are conservative rather than optimistic.
Production runs on 25 s cycles with in-line vision on 0.05 mm over 100 mm. That is what keeps a 120,000 pcs commitment credible in peak season.
Request a quote: sc@bquq.com | WhatsApp +86 13713157787 | Dongguan, China
Related reading: Passive vs Active Heat Sinks: Which Cooling Solution Do You Need?.
See also: Extruded vs Stamped Heat Sinks: Which Offers Better Performance for the Cost?.
Learn more about Precision Heat Pipe Heatsink Cooler.
| Parameter | Value / Range |
|---|---|
| Material | ADC12 die-cast aluminium |
| Tolerance | ±0.05 mm fin pitch; 0.05 mm over 100 mm mounting face |
| Lead time | Not specified in article |
| MOQ | Not specified in article |
| Capacity | 120,000 pcs run; 25 s cycle |
| Option | Best for | Trade-off |
|---|---|---|
| Stamped aluminum heat sink plate | Repeatable 1.0 mm fin profile | Die wear shifts fin pitch, caught by CMM |
| Extruded heat sink | Simple uniform cross-sections | Cannot hold 1.0 mm fin profile as repeatably |
| Two-part cooler with adhesive | Complex geometries | Adhesive layer adds thermal path resistance |
| Sandblast + epoxy powder coating RAL 9005 | Corrosion protection after forming | Applied post-forming to avoid cut-through at fin roots |
| Stage | Control | Record |
|---|---|---|
| Stamping | Single 63 T stroke forms whole plate | ±0.05 mm tooling run |
| Fin forming | Die forms every fin in one stroke | Pitch within ±0.05 mm across 120,000 pcs |
| Inspection | CMM 0.001 mm resolution per lot | Thermal resistance 0.35 K/W measured |
| Coating | Sandblast + epoxy powder coating RAL 9005 after forming | Corrosion protection not cut at fin roots |
The plate combines a 1.5 mm fin pitch with 1.0 mm stock in ADC12 die-cast aluminium. This allows 20 x 20 x 10 mm parts to maintain 0.05 mm over 100 mm on the mounting face.
Thermal resistance is 0.35 K/W, measured at CMM 0.001 mm resolution per lot. The one-piece stamped geometry removes the adhesive layer found in two-part coolers, cutting the thermal path.
Stamping gives a repeatable 1.0 mm fin profile that extrusion cannot hold. The die forms every fin in one stroke, so pitch stays within ±0.05 mm across a 120,000 pcs run.
A single 63 T stroke forms the whole aluminum heat sink plate. Tooling runs ±0.05 mm, and the 25 s cycle feeds a 120,000 pcs line.
Further technical detail: What Is the Minimum Extruded Heat Sink Fin Thickness?.
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.
Recommended reading: How Are Stamped Parts Finished? Plating, Coating and Surface Options.
The sandblast + epoxy powder coating RAL 9005 finish is applied after forming. This ensures corrosion protection does not get cut through at the fin roots the way it does on machined parts.
Compare it with aluminum heat sinks.
The one-piece geometry removes the adhesive layer found in two-part coolers, cutting the thermal path. Nothing sits between ADC12 die-cast aluminium and the airflow except the stamped surface itself.
| Parameter | Specification |
|---|---|
| Material | ADC12 die-cast aluminium |
| Fin thickness | 1.0 mm |
| Fin pitch | 1.5 mm |
| Fin height | 22 mm |
| Base thickness | 1.0 mm |
| Base flatness | 0.05 mm over 100 mm |
| Thermal resistance | 0.35 K/W |
| Surface finish | sandblast + epoxy powder coating RAL 9005 |
| Monthly capacity | 120,000 pcs |
| MOQ (prototype) | 50 pcs |
| Lead time (production) | 20 working days |
| Size range | 20 x 20 x 10 mm |
