| 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 |
Round flanges and end caps do the heavy lifting in every EV drivetrain: they seal the e-motor housing, mount the gearbox to the motor, close coolant pumps and compressors, and locate bearings concentric to the shaft. Because these parts rotate or seal, their face flatness, bolt-circle runout and center-bore diameter matter more than their shape - a flange that is off by a few tenths ruins seal life and bearing alignment.
We turn these parts on precision CNC lathes up to 260 mm diameter from 6061 aluminum, 304/316 stainless, copper or brass. Faces are diamond-cut to Ra0.8, bolt holes and lightening windows are drilled in the same setup so the pitch circle runs true to the bore, and center threads or bearing seats are tapped or bored to your drawing.
Finish follows the job: diamond-cut as standard for seal surfaces, bead-blast or anodize for visual aluminum parts, or passivated for stainless. We hold +/-0.01 mm on critical bores and face flatness, run CMM first-article reports, and ramp from 1-3 day prototypes to serial production under NDA.
CNC lathes handle round flanges, end caps and housing parts up to 260 mm diameter with Ra0.8 diamond-cut faces.
Bolt holes and lightening windows are drilled in the same setup as the bore, so the pitch circle runs concentric.
Aluminum for weight, 304/316 stainless for pressure and corrosion, copper/brass where conductivity is needed.
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 CNC aluminum battery end plates and mounting brackets for EV packs - milled pockets, automotive hole patterns, black or clear anodize.
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Custom CNC-machined aluminum automotive components for EV - manifold blocks, valve bodies, motor flanges and ECU housings, +/-0.01 mm tolerance.
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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.
