This is a CNC-machined Metal Heat Sink built for active and passive cooling of high-power electronics, power modules, and laser diodes. You get a flatness of 0.02mm across the mounting surface, a surf
This is a CNC-machined Metal Heat Sink built for active and passive cooling of high-power electronics, power modules, and laser diodes. You get a flatness of 0.02mm across the mounting surface, a surface finish of Ra 0.8µm, and a straightness tolerance of ±0.01mm per 100mm—all verified before shipment. Lead time is 15 days for standard aluminum alloys, and we hold a hardness of 63 HRC on steel-based sinks where structural rigidity matters.
Every 0.05mm of air gap between your IGBT and the sink adds roughly 0.5°C/W of thermal resistance. Our CNC milling and fly-cutting process holds the base flatness to 0.02mm, so you do not need thermal paste thicker than 0.05mm. We measure each surface with a coordinate measuring machine (CMM) and a profilometer. The result: a predictable thermal path for your 200W to 2kW heat loads.
We stock 6061-T6 with a yield strength of 276 MPa and thermal conductivity of 167 W/m·K. For higher conductivity, we use C1100 copper at 391 W/m·K, but we recommend anodized aluminum for weight-sensitive designs. All raw material comes with mill certificates. We reject any plate that shows internal voids or inconsistent grain structure before cutting.
| Parameter | Value | Notes |
|---|---|---|
| Available Materials | Aluminum 6061-T6, 5052, 7075; Copper C1100; Brass H59 | Custom alloys on request |
| Base Plate Thickness | 3mm to 25mm | For mounting surfaces |
| Fin Height | 10mm to 80mm | Aspect ratio up to 20:1 |
| Fin Thickness | 1.0mm to 3.0mm | Min. 0.8mm with tight pitch |
| Hardness (Al 6061-T6) | 95 HRB (approx. 45 HRC equivalent) | As-tempered |
| Hardness (Steel Option) | 63 HRC | For structural mounts |
| Flatness Tolerance | 0.02mm over 200mm x 200mm | Per CMM inspection |
| Surface Finish | Ra 0.8µm on base; Ra 1.6µm on fins | Fly-cut standard |
| Runout (Hole-to-Base) | ≤ 0.05mm | For mounting hole patterns |
| Lead Time | 15 days (aluminum), 20 days (copper) | For quantities up to 5,000 pcs |
| MOQ | No MOQ | 1 piece prototype accepted |
We use a 3-axis and 5-axis CNC milling center to produce straight fins, pin fins, or dovetail slots. For fin pitches below 2.5mm, we switch to a custom saw-blade cutter that reduces burr formation. After machining, we tumble every part for 30 minutes to remove micro-burrs that your assembly line would otherwise catch. We also offer a skiving process for fins as thin as 0.8mm, which gives you 30% more surface area than extrusion.
Every batch goes through a 3-point check. First, a CMM measures critical mounting holes and base flatness. Second, an air gauge verifies hole diameters to ±0.01mm. Third, for liquid-cooled versions, we perform a 0.6 MPa air leak test under water. We send you a PDF inspection report with each shipment. If a part fails, we scrap it on the floor—not in your incoming quality check.
We offer Class 2 black anodizing (18–20 µm thickness) for aluminum, which adds dielectric strength of up to 800V. For copper, we provide electroless nickel plating to prevent oxidation at high humidity. If you need a bare surface for maximum thermal conductivity, we ship it with a VCI anti-corrosion paper and sealed poly bags. We do not apply any coating without your written approval.
Send a STEP or IGES file, and we generate a DFM report within 24 hours. For a single prototype, we use the same CNC program as production, so you get identical geometry. We do not charge tooling fees for standard shapes. Only if you require a new skiving blade or custom fixture, we quote a one-time cost of $200–$800, which is waived once you order over 500 pieces.
We operate with no MOQ—you can order one piece for testing, and the unit price is only 15% higher than at 1,000 pieces.
Yes, we machine any fin pattern—straight, pin, or offset—based on your CFD data, and we will suggest a fin pitch based on your fan curve.
We measure flatness on a granite table with a dial indicator at 9 points, and we provide the CMM report before shipping.
Copper prototypes take 20 days because of longer machining time and additional deburring steps, but we can rush it to 12 days for an extra 10% fee.
If you are unsure whether to use 6061-T6 or copper, check our CNC cutting tool selection guide for tips on machinability and tool wear. For tolerance decisions, read our CNC machining tolerances guide to see what is achievable without driving up cost. Both guides are written by our shop floor engineers, not marketing staff.
We are a precision manufacturing factory in Dongguan, China, with 20 years of experience in CNC machining, stamping, and springs. Our heat sinks have shipped to 14 countries for use in EV chargers, medical lasers, and industrial inverters. We keep our process simple: you send a drawing, we quote in 12 hours, and we ship with full inspection data.
Send your drawing for a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. Mention "Metal Heat Sink" in the subject line, and we will prioritize your DFM review.
| Parameter | Capability |
|---|---|
| Materials | AL6063/6061/5052, pure copper C1100, copper-aluminum composite |
| Process | Extrusion, CNC machining, skiving, forging, die casting, stamping fins |
| Fin Types | Extruded, pin fin, skived, folded, bonded, heat pipe, vapor chamber |
| Surface | Black anodizing, clear anodizing, nickel plating, powder coating |
| Size Range | Max 1500 x 400 x 300 mm |
| Thermal Test | Thermal resistance and heat dissipation data per batch |
| Prototype | 5-7 days, no MOQ on samples |
| Inspection | CMM, thermal resistance tester, full report per batch |
