| 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 custom CNC machined aluminum heat sinks are purpose-built thermal components that carry heat away from power semiconductors, LED arrays, driver boards and enclosures. Cut from solid 6063 or 6061 aluminum plate, each sink combines dense, precision-milled cooling fins with a flat, fly-cut mounting base and all mounting features - counterbore holes, tapped threads and dowel pin holes - in one rigid part.
Because every fin, pocket and hole is cut on 3-axis CNC mills rather than shaped by an extrusion die, we can produce optimized fin layouts, asymmetric profiles and complex cutouts that off-the-shelf extruded sinks cannot match. The contact face is held to tight flatness and surface finish so a thin, consistent layer of thermal paste or gasket makes full contact, directly lowering junction temperature and improving reliability.
Whether you need a prototype heat sink to validate a new power module, a low-volume run for medical or industrial cooling, or tens of thousands of parts for LED lighting and telecom systems, we machine from your 2D/3D drawing, hold +/-0.005 mm on critical features, and supply material certificates, CMM reports and anodizing - from first article to volume, under NDA.
Dense straight or profiled fins cut to exact pitch and height on 3-axis mills, with fin thickness down to 0.5 mm and optimized aspect ratio for airflow.
Fly-cut mounting faces controlled for flatness and surface roughness so thermal grease or phase-change material spreads uniformly across the die interface.
Clear, black or color anodizing, sandblasting and laser marking, with CMM inspection, material certs and first-article reports on every batch.
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.
U-channel clamp-on aluminum heat sinks with semicircular base for pipes and cylindrical housings, black anodized, CNC cut and drilled to your fixture.
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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 black anodized aluminum heat sinks with dense fins, flat base and drilled mounting holes for power supplies, amplifiers and PCB electronics.
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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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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.
