| 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 extruded aluminum heat sinks are the workhorse solution for cooling power semiconductors, ICs, M.2 SSDs, LED boards and small inverters. Extruded from 6063-T5 aluminum with high-aspect-ratio fins, each profile is cut to your length and can be drilled, tapped, slotted or fitted with adhesive backing so it arrives ready to snap onto your PCB.
We keep the most common profiles in stock for fast, low-cost sampling - from tiny 8.8 mm MOSFET sinks up to 35 mm power packages. For higher volumes or non-standard geometry, we open custom extrusion tooling and follow it with CNC secondary machining and anodizing, so fin pitch, height and base thickness are tuned to your airflow and thermal budget.
Whether you need a few hundred passive IC sinks for a motherboard, thousands of black-anodized LED heat sinks, or a custom extruded cooler for a motor drive, we cut, machine, finish and inspect to your drawing - with flat base contact, tight cut tolerance and full material certs, from one-off samples to 50,000+ pieces per month.
Common 6063 extrusions held in inventory and cut to your length in days - ideal for prototyping and mid-volume orders without tooling cost.
For high-volume programs we design and open custom die tooling to match your exact fin pitch, height, footprint and base thickness.
Holes, slots, tapped threads, chamfers and adhesive backing pads are machined in-house, with black or clear anodizing available.
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 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 T2 copper skived-fin heat sinks for high-power CPU, IGBT, laser diode and liquid cold plate bases - milled flat, tapped holes, skived integral fins.
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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 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.
