| 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 |
Earphone metal parts are tiny, but users feel every flaw: a burr inside a nozzle thread, a bore that grips the driver awkwardly, an anodized ring that fades after a month in a pocket. Our turning program treats sub-gram parts with the same discipline as structural components.
What we turn: nozzle and filter holders; driver housings and rear chambers; threaded connector bodies (MMCX, 2-pin, 3.5/4.4mm); tuning-vent inserts; slider and splitter components; decorative accent rings — 6063/6061 aluminum and brass, Ø2–30mm.
Small-part discipline: Swiss-type lathes hold ±0.005mm on bores and threads; parting and back-turning operations are deburred with brush and micro-media so no burr ever meets a cable or an ear. Threads are gauge-checked per lot — MMCX threads that cross strip plating and frustrate users.
Anodize tuned for skin contact: Type II anodize in black, silver, champagne or custom PMS with ΔE batch control; dye lots archived so your year-two reorders match the launch batch. Sealing quality is verified because unsealed pores fade fastest against sweat and friction.
Fit with the rest of your BOM: send the driver and connector datasheets — we machine interface bores and thread starts so your assembly line presses, never files. Batch sizes from 1,000 pieces, Kanban replenishment available for high-runners.
Ø2–30mm parts on Swiss lathes at ±0.005mm — bores, threads and profiles in one cycle.
MMCX/2-pin threads Go/No-Go per lot; no cross-threading, no stripped plating.
Sealed Type II with ΔE control; reorders match your launch batch months later.
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.
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 13790500374
Email: info@rejincnc.com
Your CAD files are kept strictly confidential. Quotation within 24 hours.