CNC Machined Aluminum Heat Sink
A CNC machined aluminum heat sink starts from an extruded profile, a skived body, or a solid aluminum block, then is precision-machined into a finished, ready-to-mount cooler. Drilled and tapped holes, counterbores, pockets, edge breaks, and locating features are cut to your drawing — so the part lands on your assembly line ready to bolt down, with no secondary operation. This precision machined heat sink is built for power electronics where a stock extrusion simply will not fit.
- Product Introduction
A CNC machined aluminum heat sink starts from an extruded profile, a skived body, or a solid aluminum block, then is precision-machined into a finished, ready-to-mount cooler. Drilled and tapped holes, counterbores, pockets, edge breaks, and locating features are cut to your drawing - so the part lands on your assembly line ready to bolt down, with no secondary operation. This precision machined heat sink is built for power electronics where a stock extrusion simply will not fit.
- Machined to drawing - through-holes, M-threads, counterbores, pockets, slots, and locating features
- Tight tolerance - ±0.05 mm typical; flat, burr-free base for full device contact
- Not limited by a die - any hole pattern, cutout, or pocket your module needs
- Custom finish - natural, clear anodized, or black anodized; engraved marking on request
What a CNC Machined Aluminum Heat Sink Is
A precision machined heat sink is what you get when a raw cooling profile is taken past the extrusion die and finished on a CNC machining center. We start from a base shape - a dense-fin extrusion, a one-piece skived body, or a solid aluminum block - then mill, drill, tap, and counterbore it into the exact geometry your power device and enclosure demand. The fins do the thermal work; the machined features do the mounting work.
For an overseas buyer, the practical upside is simple: a CNC aluminum heat sink arrives ready to bolt down. The through-holes line up with your module, the threads are already cut, the counterbore seats your fastener flush, and the locating pocket positions the device without a jig. You remove a manual drilling or tapping step from your own line - fewer fixtures, fewer rejects, faster assembly.
Engineering note for buyers: Send us your STEP, PDF drawing, or even a hand sketch with the device footprint, hole pattern, and target flatness. We run a DFM check (fin pitch vs. tool access, wall thickness around threads, flatness achievable) and return a machined quote with lead time - before any cutting begins.
Product Overview
Three angles of the same CNC-machined cooler - the raw finned body, the finished machined part, and the precision base features close-up.
Raw finned body
Extruded or skived fins on a base. No holes yet - the starting profile before CNC.
Finished machined view
Flanges drilled and tapped, end pocket cut, edges broken. Ready to bolt onto your module.
Base feature close-up
Through-holes, counterbores, tapped threads, and a locating pocket - all machined in one setup for repeatability.
Why Buyers Specify a CNC Machined Cooler
One Line Item, No In-House Op
The cooler arrives drilled, tapped, and pocketed. You drop one finished part into BOM instead of a raw profile plus a machining subcontract.
For Procurement Teams
Repeatable to Drawing
All features cut in one CNC setup, so batch-to-batch geometry stays put. We supply the machined drawing and first-article report.
For Mechanical Engineers
Fits Where a Die Can't
Non-standard hole patterns, angled mounting faces, pockets for tall capacitors - geometry a standard extrusion die cannot deliver.
For Power Electronics OEMs
Custom & Branded
Neutral or private-label marking, consistent finish, and tiered pricing for recurring CNC machined heat sink programs.
For Distributors
Technical Specifications
Reference CNC-machined build. Features and tolerances are set to your drawing.
| Parameter | Specification |
| Base Material | Aluminum 6063-T5; optional 6061-T6, 1050/1070 high-conductivity grade |
| Starting Form | Extruded profile, skived body, or solid block, then CNC finised |
| Machnining Features | Through-holes, tapped holes (M2–M8), counterbores, pockets, slots, edge breaks, locating features |
| Machining Tolerance | ±0.05 mm typical; ±0.02 mm on critical features |
| Base Flatness | ≤ 0.05 mm typical after CNC / light fly-cut |
| Surface Finish | Natural; clear or black anodizing; optional laser/engraved marking |
| Thermal Resistance | Set by the base profile; ~0.2–3.0 °C/W depending on fins and airflow |
| Cooling Method | Natural convection or fan-assisted |
| Max Part Length | Up to ~1,200 mm on our machining centers (longer via indexed setup) |
| Certifications | RoHS, REACH compliant; ISO 9001 manufacturing |
CNC Machined Cooler Selection Guide
Pick the starting form and machining scope that matches your device and enclosure.
| Application | Starting Form | Typical CNC Features |
| IGBT/Power module | Skived or dense extrusion | Flat base, tapped holes, locating pocket, flange |
| SSR / relay base | Extrusion | Through-holes, counterbores, center groove |
| Sealed enclosure wall | Extrusion | Edge break, gasket groove, through-bolt holes |
| LED COB/ driver | Low fin extrusion | Center hole, tapped posts, wire-slot cutout |
| Custom module | Solid block | Full pocketing, deep holes, angled face mill |
Manufacturing Process Chain
From raw profile to a finished, ready-to-mount cooler in one controlled flow.
Base Form
Extrusion, skiving, or solid block
Cut to Length
Sawn or milled to spec length
CNC Machining
Drill, tap, counterbore, pocket
Fly-Cut (opt.)
Flat base to tight tolerance
Deburr & Clean
Burr-free, assembly-ready
Finish (opt.)
Anodize, mark, inspect
Typical Applications
IGBT & Power Modules
Flat base, tapped holes, and locating pocket for bolt-down modules.
SSR & Relays
Center groove and through-holes for solid-state relay mounting.
Inverters & Drives
Non-standard hole patterns for VFD and servo drive enclosures.
LED COB & Drivers
Center bore and tapped posts for high-bay and fixture cooling.
RF & Communication
Pocketed bases for PA and transceiver modules.
Custom Enclosure Parts
Any part where a stock extrusion will not fit the box.
Engineering Support & Customization
We machine the cooler around your device and enclosure drawing. Send a STEP, PDF, or sketch.
Free DFM Review
We check fin pitch vs. tool access, wall thickness around threads, and achievable flatness.
Any Feature, To Drawing
Holes, threads, counterbores, pockets, slots, and locating features cut in one setup.
Fast Sampling
CNC samples in 5–7 working days; new setup qualifies quickly for repeats.
Full Documentation
Machined drawing, 2D, STEP, first-article report, material certificate, RoHS/REACH statement.
Flexible MOQ
Low MOQ for prototypes; volume pricing for 1,000+ runs.
Global Export
FOB, CIF, DDP, and door-to-door logistics for NA, EU, and Asia.
What Customers Say
T. Nguyen
Power Electronics Engineer, Vietnam
J. Pereira
Mechanical Engineer, Portugal
A. Schmidt
Procurement Lead, Germany
FAQ
Q: What is a CNC machined aluminum heat sink used for?
A CNC machined aluminum heat sink is used wherever a stock extrusion cannot provide the exact mounting geometry. The fins still dissipate heat, but the CNC features - drilled and tapped holes, counterbores, pockets, locating features - let the part bolt straight onto your module and enclosure without extra work on your side.
Q: Can you machine to our drawing or sample?
Yes. Send a STEP, PDF, or sample. We machine through-holes, tapped threads (M2–M8 typical), counterbores, pockets, slots, and locating features to your spec, then return a machined drawing and first-article report for sign-off.
Q: Which surface finish and marking do you offer?
Natural aluminum is standard. Clear or black anodizing is available for corrosion protection and improved radiated heat loss. We can laser-engrave or silk-screen your part number or logo for private-label programs.
Q: What is the MOQ and lead time?
CNC samples ship in 5–7 working days. Volume repeats run on a scheduled basis with flexible MOQ for first-time buyers and prototype runs. Lead time scales with feature complexity and order quantity.
Q: Does CNC machining affect the cooling performance?
Not the fins - those are cut from the base profile as before and keep their thermal behavior. CNC only adds mounting and locating features. Where a pocket or clearance cut is needed near the fin root, we size it to avoid weakening the thermal path, which we confirm in the DFM review.
Related Heat Sink Pages
Custom Extruded Aluminum Heat Sink - hub for made-to-spec profiles
CNC Machined Dense-Fin Heat Sink 200×85 - a stock CNC size
IGBT Module Heat Sink - power module cooling
Skived Fin Heat Sink - one-piece high-power cooler
High-Density Fin Power Supply Housing - flange + housing
U-Shaped Heat Sink Enclosure - integrated housing
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