Heat Sink Castings
Cast heat sinks with tall thin fins, for electronics that need volume rather than a machined block.
Cast heat sinks when the fin stack is too tall or too many for machining to be economic. Fin thickness is limited by how well the metal fills the tool, so we design to what casts, not to what looks tightest.
6–8 weeks
250 pieces
ISO 9001:2015
Technical Specifications
| Parameter | Value | Unit |
|---|---|---|
| Fin thickness from | 1.2 | mm |
| Fin height to | 40 | mm |
| Fin pitch from | 3.0 | mm |
| Thermal conductivity | ~150 | W/m·K |
| Mounting face | ±0.1 | mm |
| Draft | 1.5–2 | ° |
Available Materials
- AlSi10Mg
- A380 / ADC12
- AlSi12 (best fluidity)
Typical Applications
- Inverter and charger cooling
- LED drivers
- Power supply bodies
- Battery cooling plates
- Telecom radio units
Surface Finishes
- As-cast (functional)
- Shot blast
- Conversion coating
- Black anodise (thermal)
- Machined mounting face
Industries Served
- Automotive & EV
- Telecom & 5G
- Energy & Oil & Gas
- Consumer Electronics
- Rail
What drives the price of this part
Derived from the callouts on this page. Where a driver is not on the drawing, it is not on this list.
- Part size
- Fin thickness from at 1.2 mm decides which machine the part lands on and how many setups it needs. Size is the driver buyers most often leave out of a first enquiry, and it is the one that changes the quote fastest.
- Order size
- Minimum order is 250 pieces, where setup and tooling are amortised across the batch and per-part cost settles around cycle time and material. Below that quantity the same part costs more per piece, not less.
- Certification and paperwork
- ISO 9001:2015. On a certified family the inspection and documentation work is part of the price: first article inspection, material traceability and the dimensional report are produced per order, not per sample.
See how cycle time is calculated in the machining time calculator and what else moves a price in the cost driver reference.
How these parts are inspected
Matched to the callouts above and the instruments actually on the floor.
- Coordinate measuring machine (Zeiss CONTURA G2, two machines, GR&R 8.4% on the critical feature)
- Dimensional report against the drawing, with a 100% check on critical features rather than a sample
- Certificate of conformance and the mill certificate with every shipment
The full equipment list, with counts, is on the capability page; the inspection sequence is on quality and inspection.
Questions buyers ask
- Cast or extruded heat sink?
- Extruded for a straight fin stack, because the tooling is cheap and the fins are sharp. Cast once the shape curves, the fins vary height or you need mounting bosses in the same part.
Related part families
LED Light Housings (Die Cast)
Cast luminaire bodies that use the housing itself as the heat path, IP-rated.
Motor Housings (Die Cast)
Cast motor housings with integral cooling fins and machined stator seats.
Aluminium Die Cast Housings
High-pressure aluminium housings from 0.5–15 kg, trimmed, machined and sealed-face checked in-house.