| 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 |
When junction temperature cannot be held by an aluminum sink, the answer is copper. T2 (C11000) pure copper conducts heat at roughly 400 W/mK - about twice 6063 aluminum - which cuts spreading resistance in half for dense, high-flux chips such as high-end CPUs, IGBT modules, laser diodes and RF power transistors.
These sinks are skived from a solid copper block: thin fins are cut directly from the base plate, so there is no solder, epoxy or interference layer between fin and base. The contact face is fly-cut flat and milled to seat against CPU lids, IGBT packages or laser submounts, and tapped holes (often with steel inserts) bolt the heavy copper sink down without crushing the soft base.
Copper sinks are also the standard base material for liquid cold plates - the thick, flat copper plate is the interface between device and coolant channels. We CNC mill the base, skive the fins, drill and tap mounting holes, and finish to your drawing. Samples ship within days; production runs scale under NDA.
At ~400 W/mK, T2 copper spreads heat away from a small die faster than any aluminum alloy - the default choice when junction temp matters.
Fins are cut from the base plate itself, eliminating the bonded-interface thermal resistance that limits glued aluminum or copper sinks.
The thick flat copper face is the standard interface for liquid cold plates - we mill it flat and drill ports for coolant manifolds.
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 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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Custom stacked-fin round aluminum heat sinks for high-power LED downlights, street lights and COB modules - dense radial fins, CNC center bore, natural finish.
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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.
