This Mosfet Heatsink is a CNC-machined aluminum or copper thermal dissipator designed to bolt directly onto TO-220, TO-247, and TO-264 packages. We hold flatness to 0.02mm across the mounting face an
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This Mosfet Heatsink is a CNC-machined aluminum or copper thermal dissipator designed to bolt directly onto TO-220, TO-247, and TO-264 packages. We hold flatness to 0.02mm across the mounting face an
This Mosfet Heatsink is a CNC-machined aluminum or copper thermal dissipator designed to bolt directly onto TO-220, TO-247, and TO-264 packages. We hold flatness to 0.02mm across the mounting face and surface finish to Ra 0.8µm, which drops junction-to-case thermal resistance by up to 15% compared to stamped alternatives. Typical lead time is 5 working days for prototypes, and we ship from our Dongguan factory with a hardness of 90 HB (annealed) or T6 temper (6061-T6) depending on your current load.
Stamped heatsinks bend under repeated thermal stress—fin base warps after 500 cycles. We machine each fin from solid bar stock, so the base plate stays flat. Our CNC process holds fin thickness to ±0.05mm and fin spacing to ±0.1mm. That consistency means uniform airflow across every channel. You get predictable cooling, not hot spots. We do this on 3-axis and 4-axis mills, with cycle times from 4 to 18 minutes depending on fin density.
We use 6061-T6 aluminum as the default: thermal conductivity 167 W/m·K, weight 2.7 g/cm³, and it anodizes cleanly. For high-current SiC or GaN modules, we machine C11000 copper: 385 W/m·K, but you pay in weight—8.9 g/cm³. We also offer 6063-T5 for extrusions that need tighter dimensional control after bending. Every material lot is traceable to the mill certificate. If you need a hybrid—copper base with aluminum fins—we friction-stir weld those, and we hold the interface flatness to 0.02mm so the joint does not become a thermal bottleneck.
Rough surfaces trap air, and air is an insulator. We machine the mounting face to Ra 0.8µm, which gives you a real contact area of about 85% with thermal paste. If you skip paste and use a phase-change pad, we can take the face to Ra 0.4µm with a diamond fly cutter—that lifts contact to 92%. For corrosion resistance and emissivity, we offer black anodizing (MIL-A-8625 Type II, 18–25µm thickness). That coating raises the radiative heat transfer coefficient from 0.8 to 0.9 W/m²·K. We do not anodize copper; we apply nickel plating (5–8µm) instead to prevent oxidation.
We machine clearance holes for M3, M4, or #6-32 screws directly into the base. Standard patterns are 2-hole (TO-220) and 3-hole (TO-247) at 2.54mm pitch, but we also cut custom patterns from your drawing. Threads are roll-formed for strength—that gives you a minimum pull-out force of 180 N on M3 in 6061-T6. If you need threaded studs instead of holes, we press-fit stainless steel studs with a retention force above 300 N. Every hole location is measured on a CMM; we hold true position to 0.05mm relative to the mounting face.
We do not ship without a full report. Each Mosfet Heatsink goes through a 3-step check: (1) CMM measurement of base flatness, hole positions, and fin height; (2) profilometer scan for Ra on the mounting face; (3) a thermal resistance test on a sample from the same batch using a 100W cartridge heater. You get the data sheet with your parts. For runs above 500 pieces, we include an X-bar and R control chart from the in-process gauging. If any dimension drifts beyond 10% of tolerance, we stop the line and re-set the tool offsets.
Thin fins bend in transit if packed loose. We place each heatsink in a foam-lined slot, then stack them in a double-wall corrugated box with corner protectors. For fins thinner than 1.5mm, we add a cardboard spacer between every layer. We ship via DHL, FedEx, or UPS for small lots—3 to 5 days to the US or EU. For bulk orders, we use sea freight on pallets, each wrapped in stretch film and strapped. We have a 0.2% damage rate in the last 200 shipments; if a fin arrives bent, we replace the unit free.
Machining is not always the right answer. If you need more than 10,000 pieces per month and your fin length is under 200mm, an extruded 6063-T5 profile costs about 40% less per unit. We do both. Our extrusion dies run 2,000 to 5,000 parts per die. But if you need a compact design with varying fin height—say a stepped base for multiple components—machining is the only option. Send us your drawing and we will quote both routes. We will tell you honestly which is cheaper at your volume.
We run a CFD model in SolidWorks Flow Simulation before we cut metal. That tells us the junction temperature at your specified airflow (e.g., 2 m/s) and ambient (e.g., 50°C). We compare that to the measured result from a prototype on a wind tunnel. In the last 12 projects, our predicted vs. measured temperature delta was under 3°C. We give you the simulation report with the prototype quote. For a standard TO-220 heatsink, we can machine a prototype in 48 hours and ship it overnight.
| Parameter | Specification |
|---|---|
| Materials | 6061-T6, 6063-T5, C11000 copper |
| Standard sizes | TO-220, TO-247, TO-264, custom up to 300mm |
| Fin thickness | 0.8mm to 3.0mm (±0.05mm) |
| Fin spacing | 2.0mm to 6.0mm (±0.1mm) |
| Base flatness | 0.02mm over 100mm length |
| Surface finish (mounting face) | Ra 0.8µm standard; Ra 0.4µm optional |
| Hardness | 90 HB (annealed), 95 HB (T6 temper) |
| Hole position tolerance | ±0.05mm true position |
| Lead time (prototype) | 5 working days |
| Lead time (production) | 10–15 working days |
| MOQ | No MOQ – we machine one piece for you |
No MOQ—we machine a single prototype for you at the same per-unit price as a run of 100, though shipping cost per unit drops if you order more.
Yes, we machine any hole pattern from your drawing, including countersinks, counterbores, and threaded studs, with true position held to ±0.05mm.
We use in-process SPC gauging on every 50th piece, plus a final CMM inspection on 5% of the batch, and you receive the full inspection report with the shipment.
For 500 pieces of a standard TO-220 profile, we ship in 12 working days; for custom shapes with copper, add 3 days for material procurement.
Send us your drawing for a firm quote within 12 hours. Email sc@bquq.com or WhatsApp +86 13713157787. For tooling decisions, read our CNC cutting tool selection guide. To verify your tolerances are realistic, check the CNC machining tolerances guide. We are a precision manufacturing partner made in China, and we answer within 12 hours.
| 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 |
