| 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 a standard round sunflower sink cannot meet your mechanical or thermal spec, the answer is a custom 6061 round extrusion tooled to your drawing. These sinks combine radial cooling fins with integrated T-slots, mounting bosses and internal ribs - all extruded in one piece - so the sink also functions as a structural part of your fixture rather than a bolt-on accessory.
We prefer 6061-T6 over 6063 for these custom round profiles because it is stronger, machines cleaner and holds threaded bosses and cantilevered mounting tabs without yielding. After extrusion, the center bore, cross-holes, slots and mounting faces are finished on CNC centers to tight tolerances, then clear anodized. This is the typical solution for high-end LED downlights, machine-vision sensor heads, cylindrical power supplies and custom instrument enclosures.
Send us your 2D drawing or 3D model - we will review the tooling, propose fin geometry for your target wattage, and return samples within weeks for approval before production. Volumes scale from 100-piece prototypes to 50,000+ per month under NDA.
If no stock profile fits your envelope, we open a dedicated extrusion die for your fin count, height and internal features - one part that cools and mounts.
Stronger than 6063, 6061 carries threaded bosses, T-slots and cantilevered tabs so the sink doubles as a structural component.
Center bore, cross-holes, slots and faces are CNC-machined to your model with +/-0.05 mm tolerance - no secondary fixturing on your line.
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 6063 extruded aluminum heat sinks for audio amplifiers, inverters, welders and power supplies - flat transistor base, drilled mounting holes, natural or black anodized.
View Product →
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.
View Product →
Standard aluminum extrusion heat sink profiles in black anodized or natural finish - 6063, cut to length, drilled holes, fast samples from stock.
View Product →
Custom sunflower pin-fin round aluminum heat sinks for COB LED and high-power lighting - radial fins, central bore, gold anodized, drilled mounting holes.
View Product →
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.
