| 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 |
Standard rectangular aluminum extrusion heat sinks are the workhorse of electronics cooling. Extruded from 6063-T5 aluminum in a range of stock profiles, each sink is CNC-cut to your length, drilled with mounting holes and finished in either matte black anodize or clear natural silver - so you get the right fit and look without paying for custom tooling.
Black anodize adds corrosion resistance and hides machining marks for amplifiers, power supplies and exposed equipment; clear natural silver keeps cost down and preserves the highest surface emissivity for internal chassis and enclosure cooling. The flat milled base seats tightly against TO-220, TO-247 packages, ICs, MOSFETs and LED modules with thermal grease.
Because we hold a wide range of standard profiles in stock, samples and small batches ship within days, while production volumes run up to 50,000+ pieces per month under NDA. For non-standard fin geometry or higher power, we also open custom extrusion tooling and CNC finish to your drawing.
A library of standard 6063 extrusions in different widths, heights and fin pitches covers most natural-convection and forced-air applications without tooling cost.
Choose black hard anodize for corrosion resistance and appearance, or clear natural silver for best emissivity and lowest part cost.
Profiles are CNC cut to length with square ends, then drilled or tapped to your mounting pattern - ready to bolt onto your board or chassis.
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 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 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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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.
