| Tolerance Type | Description |
| Precision Tolerance | Parts are manufactured and inspected strictly according to your drawing specifications and GD&T annotations, with a minimum tolerance of ±0.05 mm. |
| General Tolerance | ±0.05 mm |
| Minimum Feature Size | 0.5 mm. The exact minimum feature size may vary depending on the part geometry and selected material. |
| Threading & Tapped Holes | Capable of machining any standard thread sizes, as well as customized thread specifications. |
| Edge Condition | Sharp edges are deburred and chamfered by default. |
| Surface Finishing | Anodizing, Powder Coating, Spray Painting, Laser Engraving, Silk Screen Printing |
| Minimum Wall Thickness | 0.5mm |
| Minimum End Mill Size | 0.5mm |
| Minimum Drill Hole Size | 1mm |
| Minimum Part Size | CNC Milling: 5 × 5 × 5 mm; CNC Turning: 2 × 2 mm; |
| Maximum Part Size | CNC Milling: 4000 × 1500 × 600 mm
CNC Turning: 200 × 500 mm |
These mid-to-large extruded aluminum heat sinks are engineered for real power - output transistors in audio amplifiers, IGBTs in inverters and welders, and switching devices in power supplies. Cut from 6063-T5 extrusion with tall, closely spaced fins, each sink gives the high surface area needed to hold junction temperature down under sustained load, while a flat, machined base seats power devices tightly.
Unlike small passive IC sinks, these power sinks are built around your device layout: counterbored clearance holes for transistor mounting screws, tapped positions for bus bars or PCB standoffs, and a fly-cut base face that mates evenly with thermal grease or insulator pads. We cut, drill and tap standard profiles to your dimensions, or open custom extrusion tooling for production volumes.
Whether you are cooling a few pairs of output transistors in a hi-fi amplifier, a bank of IGBTs in a VFD, or a bridge rectifier in a welding machine, we supply the sink in natural mill finish or clear/black anodized - with dimensional inspection on every batch and material certs, from prototype to 50,000+ pieces per month.
High-aspect-ratio fins maximize convective surface area for forced-air or natural convection cooling of output transistors and IGBTs.
Machined base surface ensures a tight, even interface with transistors, insulators and grease - the single biggest factor in low thermal resistance.
Drill counterbores for transistor screws, tapped holes for standoffs and bus bars, all positioned to your device drawing.
From aerospace-grade aluminum to medical-certified engineering plastics, our in-house CNC machining centers work a broad range of metals and plastics under one roof.
Don’t see your material? Send your drawing for review — we will confirm availability and quote it.
Functional and cosmetic finishes applied in-house or through vetted partners.
Type II protective anodize, natural silver finish.
Type III hard coat, wear-resistant black.
Blue, red, gold, green dye for audio and 3C.
Uniform matte texture, hides machining marks.
Durable corrosion-resistant RAL colors.
Removes free iron, boosts stainless corrosion.
Zinc, nickel, chrome, tin for connectors.
Permanent non-contact logos and serials.
Custom skived-fin aluminum heat sinks for IGBT and power modules - milled flat base, dense comb fins, drilled and tapped holes to your module pattern.
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Custom sunflower pin-fin round aluminum heat sinks for COB LED and high-power lighting - radial fins, central bore, gold anodized, drilled mounting holes.
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Custom CNC aluminum heat sinks with milled fins and integrated mounting holes - 6063/6061, anodized, +/-0.005 mm, prototype to volume.
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Custom extruded aluminum heat sinks - 6063 profiles cut to size with CNC holes, anodizing and adhesive backing. From tiny MOSFET sinks to inverter coolers, prototype to volume.
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High-efficiency VMCs for prototype, mid-volume and large-batch metal parts production.
Integrated drilling, tapping and milling shortens lead time for aluminum enclosures.
Combined drilling-milling lines support both small batches and volume OEM orders.
Well-organized production zones support everything from one-off parts to mass programs.
Systematic line layout raises machining efficiency and guarantees on-time delivery.
Complete CNC equipment set enables stable continuous running for OEM volumes.
Dongguan, China · 200+ CNC machines · In-house anodizing & laser cutting · Visitors and third-party inspections welcome.
Fully certified quality management system. Every batch ships with material certificates and inspection reports you can trust.
Our engineers review every drawing upfront — flagging tolerances, undercuts and cost drivers before a single chip is cut.
Custom foam, wooden crates and FBA-ready packaging. Door-to-door freight to 60+ countries with full tracking.
Your message lands directly with our senior engineers — instantly acknowledged.
We study your requirements and propose a workable solution with material & process options.
Detailed quotation with specs, options and lead time — no hidden fees.
Approve the sample, then we mass-produce with full QC and on-time shipping.
WhatsApp: +86 18362358467
Email: info@rejincnc.com
Your CAD files are kept strictly confidential. Quotation within 24 hours.
