| 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 |
Stacked-fin round heat sinks solve the cooling problem that a single extruded sunflower profile cannot: they pack far more fin surface into a round luminaire envelope by stacking thin aluminum fins radially around a CNC-machined center base. The result is a taller, denser, lighter sink that keeps high-wattage COB LED downlights, street lights and high-bay luminaires at safe junction temperatures.
Each fin is cut from thin 6063 aluminum sheet, stacked radially and bonded to a machined base with a central bore that nests the COB module or star-pattern LED. Because fins are thin and densely packed, the cooling surface per kilogram is much higher than a solid extrusion - which is why LED fixture designers choose stacked-fin sinks above 50 W per module, especially for outdoor fixtures where fans are not allowed.
We supply standard stacked-fin profiles in a range of diameters and heights, or CNC-machine the center bore, mounting holes and finish to your luminaire drawing. Natural silver clear anodize is standard; black or other colors are available. From prototype samples to 50,000+ pieces per month, under NDA.
Thin stacked fins pack 2-3x the cooling surface of a solid extrusion into the same envelope, lowering total luminaire weight and cost.
Fin heights up to 150 mm drive heat upward in still air, removing the fan from outdoor and architectural luminaires.
The center hole is precision-machined to nest your COB module or star-base LED, with a flat base for low thermal resistance.
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 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 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 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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Standard aluminum extrusion heat sink profiles in black anodized or natural finish - 6063, cut to length, drilled holes, fast samples from stock.
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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.
