A Custom Heat Sink Manufacturer for Low Volume — No Tooling
Most aluminum heat sinks are extruded, which is excellent for huge volumes of a simple fin profile — but it needs a custom die that costs money and weeks of lead time, and forces a high minimum order. The moment you need a custom heat sink with a non-standard footprint, mounting bosses, a milled pocket for the PCB, or just a handful of pieces, extrusion stops making sense.
EKINSUN machines them instead. As a custom heat sink manufacturer we CNC mill your design straight from solid aluminum — no die, no tooling charge, and a minimum order of one piece. You get the exact fin layout, thickness and mounting you drew, and the same program scales from a single prototype to a production batch.
CNC Machined vs Extruded Heat Sinks — When Machining Wins
| Extruded heat sink | CNC machined heat sink (EKINSUN) | |
|---|---|---|
| Tooling | Custom die required (cost + weeks) | None — straight from solid |
| Minimum order | High, to amortise the die | 1 piece |
| Geometry | Constant cross-section only | Pockets, bosses, varying fin heights, integrated enclosure |
| Lead time | Long (die first) | Days — no tooling step |
| Best for | Very high volume, simple profile | Low/mid volume, complex or integrated parts |
If your volumes are huge and the shape is a simple finned bar, extrusion is the right call — and we'll tell you so. For everything else, machining gets you a better-fitting part with no upfront tooling.
What We Make
Machined finned heat sinks
Plate and block heat sinks with milled fins — any fin pitch, height and footprint.
Heat-sink enclosures
One part that is both heat sink and housing — fins on one face, a sealed pocket for the PCB on the other.
Cold plates
Aluminum cold plates with machined channels for liquid or contact cooling.
Cooling fin assemblies
Lightweight machined cooling fins for compact electronics and avionics.
LED & power-electronics sinks
Heat sinks for LED modules, drivers, MOSFETs, inverters and motor controllers.
From a drawing or sample
Send CAD, a 2D drawing, a hand sketch or a part to copy — we redraw it for free.
Aluminum Grades & Finishes
| Material | Best for | Notes |
|---|---|---|
| Aluminum 6061-T6 | General machined heat sinks & enclosures | Best all-round; machines and anodizes well |
| Aluminum 6063 | Fin-dense, thin-wall profiles | High thermal conductivity, easy to fin |
| Aluminum 7075-T6 | Strength-critical (UAV, aerospace) | High strength where the sink is also structural |
| Copper C110 | Maximum heat flux | Highest conductivity; heavier and costlier |
Finishes: as-machined, clear / black / colored anodizing (black slightly improves radiative dissipation), bead-blast, chromate / Alodine (keeps the surface electrically conductive), and powder coat. Tell us the thermal and cosmetic needs and we'll recommend the finish with your quote.
Catalog heat sink doesn't fit your board? That's exactly when you machine one. Send the footprint, the component to cool and the space you have — we'll machine an aluminum heat sink to it, from one piece.
Recent Job: Aluminum Heat Sink for a UAV Electronics Module
A drone client needed a lightweight aluminum heat sink that doubles as the module enclosure: machined cooling fins on one face, a milled pocket for the PCB on the other, mounting holes and a connector cut-out — all in one part. We machined it from 6061 with no tooling, confirmed the dimensions, and took it from prototype straight to a production batch. The integrated fins-plus-cavity design is something an extruded profile simply can't produce.
Frequently Asked Questions
Yes. Send a CAD file, a 2D drawing, a hand sketch or a sample. We machine the aluminum heat sink to your exact fins, footprint and mounting — and redraw a sketch into CAD for free before machining.
We machine. No die, so no tooling cost and MOQ 1. Machining also allows pockets, bosses, varying fin heights and an integrated enclosure that extrusion can't make.
6061-T6 for general heat sinks and enclosures, 6063 for fin-dense profiles, 7075-T6 where strength matters. Copper C110 for maximum conductivity.
Yes — clear, black or colored anodizing. Black slightly improves radiative dissipation. We also offer chromate/Alodine to keep the surface conductive, and powder coat.
MOQ 1 piece with no setup fee. The same program scales to small batches and full production, with the unit price dropping as quantity rises.
Related: LED heat sinks · CNC milling · order from a sketch · parts from a sample · all custom parts · OEM / ODM production
Get a Free Quote
Send your footprint, the component to cool and quantity — or a drawing. We reply within 24 hours.
// Qty & price
1 pc
Prototype
No tooling, no setup fee
10–100
Unit price drops
Batch pricing
100+
Best price
Production run
- →No distributor — you pay the maker directly
- →CAD saved after first order — reorder anytime at lower unit price
Response within 24h · Drawings kept confidential