| 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 |
An earphone housing has three jobs at once: hold the driver in the right acoustic position, survive daily handling, and look like it belongs at a premium price. Our housing program is engineered around all three — because optimizing one at the expense of the others is how audio products get returned.
What we machine: full IEM and earbud housing sets (front, rear, nozzle); TWS charging-case inner shells; acoustic chambers with tuned vent geometry; faceplate-ready rims with groove for badges — 6063/6061 aluminum, Ø8–40mm, walls down to 1.0mm.
Acoustics need geometry, not luck: internal chamber volumes and nozzle bores are machined to your acoustic simulation dimensions — the volume your acoustic engineer modeled is the volume that ships, verified by CMM on internal features other shops skip.
High-gloss finish, production-consistent: multi-stage polish (diamond paste to mirror) before clear anodize; the gloss level is archived as a process standard and re-checked per batch under standard lighting. Chamfered edges keep color where pockets and cables rub.
Assembly-ready output: driver seats, filter threads and cable-strain slots are cut from your component datasheets; housings arrive deburred, washed and bagged so your line assembles without secondary work. From 1,000-piece pilots to 300k+ per year.
Internal volumes and nozzle bores machined to your simulation dims — CMM-verified where others skip.
Polish standard archived and re-checked per batch; unit 100,000 shines like unit 1.
Driver seats and threads cut from component datasheets — no filing 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 CNC turned aluminum knobs produced on precision lathes. We manufacture control knobs with CD texture, anodized finishes and custom bores for audio equipment, home appliances and industrial instruments.
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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 13790500374
Email: info@rejincnc.com
Your CAD files are kept strictly confidential. Quotation within 24 hours.