Precision CNC Machining & Custom Parts Manufacturer

From DFM engineering to finished parts — CNC turning, 3-axis, 5-axis milling and surface treatment under one roof. ISO 9001 & IATF 16949 certified. Expert in aluminum, stainless, brass & engineering plastics for audio, 3C electronics and industrial applications.

TRUSTED PARTNERS
Trusted by Global Brands
Precision CNC machining partner trusted by leading audio, consumer electronics, automotive and industrial brands across 60+ countries.
WHY REJIN CNC

Your CNC Partner That Actually Delivers

We understand what keeps global buyers up at night — quality drift, missed deadlines, silent suppliers. Rejin solves that with a system, not promises.

Incoming Quality You Can Verify

Every batch ships with CMM first-article reports, in-process probing and dimensional inspection — not just "OK, shipped."

On-Time, Every Time

200+ owned CNC machines in Dongguan. Your order isn't passed between brokers — we control scheduling, tools and capacity.

A Real Engineer Replies in 24h

No sales rep chasing quotes. A DFM engineer reviews your CAD, flags issues and sends a detailed quote — often same day.

Factory-Direct, No Middleman Markup

One roof: CNC machining, surface treatment and assembly. You pay for actual manufacturing, not three layers of suppliers.

Audio & Electroacoustic CNC Components

Audio & Electroacoustic CNC Components

Custom CNC audio components: control panels, enclosures, knobs, brackets & speaker parts. Aluminum 6061/6063, anodized, ±0.005mm, IATF16949 certified.
Custom 3C Electronics CNC Parts

Custom 3C Electronics CNC Parts

Custom CNC 3C electronics parts: enclosures, brackets, connectors & decorative panels. Precision aluminum, ±0.005mm, anodized finish, prototype to mass production.
CNC Precision Parts & Fasteners Manufacturer

CNC Precision Parts & Fasteners Manufacturer

Custom CNC precision parts & fasteners: screws, nuts, bolts, shafts, bushings. ±0.005mm tolerance, aluminum/stainless, anodized, IATF16949 certified.
CNC Heat Sink & Thermal Management Parts

CNC Heat Sink & Thermal Management Parts

Custom CNC machined aluminum heat sinks & thermal management components for LED, telecom, automotive, power electronics & industrial equipment. Precision cooling parts, ±0.005mm, anodized finish.
Automotive & EV CNC Parts & Components

Automotive & EV CNC Parts & Components

Custom CNC automotive & EV metal parts: engine, chassis, battery housings, motor components. ±0.005mm, IATF16949 certified, prototype to mass production.
Aerospace & UAV CNC Components

Aerospace & UAV CNC Components

Custom CNC aerospace & UAV components: structural parts, brackets, connectors & lightweight housings. High-strength aluminum/titanium, ±0.005mm, strict QC.
Robotics CNC Components & Parts

Robotics CNC Components & Parts

Custom CNC robotics components: joints, shafts, brackets, connectors & structural parts. High-precision ±0.005mm, aluminum 7075/6061, prototype to mass production.
Medical Device CNC Parts & Components

Medical Device CNC Parts & Components

Custom CNC medical device metal parts: housings, connectors, structural components & surgical instruments. Stainless steel/aluminum, strict ISO 13485 quality control.

Surface Finish Options

Functional and cosmetic finishes applied in-house or through vetted partners.

Clear anodized aluminum

Clear Anodize

Type II protective anodize, natural silver finish.

Black hard anodized enclosure

Black Hard Anodize

Type III hard coat, wear-resistant black.

Color anodized aluminum parts

Color Anodize

Blue, red, gold, green dye for audio and 3C.

Bead blasted aluminum surface

Bead Blast

Uniform matte texture, hides machining marks.

Black powder coated enclosure

Powder Coating

Durable corrosion-resistant RAL colors.

Passivated stainless flanges

Passivation

Removes free iron, boosts stainless corrosion.

Nickel plated hardware

Plating

Zinc, nickel, chrome, tin for connectors.

Laser engraved logo

Laser Marking

Permanent non-contact logos and serials.

Certified Quality

Quality you can audit, not just claim

Every batch ships with the documentation your QA team needs — and our engineers stand behind it.

  • CMM & First-Article Inspection

    Full dimensional reports on the first part and at key production milestones.

  • Material Traceability

    Mill certificates and lot tracking on every raw material we receive.

  • NDA & IP Protection

    Signed before quoting. Encrypted storage, files never reused or shared.

  • In-Process Probing

    Automated in-machine measurement reduces human error and scrap.

Materials & Capabilities

Materials we machine, tolerances we hold

In-house stock for 8 engineering alloys lets us start your job in days — not weeks — while holding ±0.005 mm critical tolerances.

Aluminum 6061 / 7075
Stainless 304 / 316L
Titanium Gr5
Brass & Copper
Carbon & Alloy Steel
POM / ABS / Peek
Inconel & Superalloys
Magnesium Alloys
Tolerance±0.005 mm critical; ±0.005 mm runout
Max Part SizeUp to 1,500 mm on large VMCs
Batch Size1-piece prototype to 100,000+ runs
CertificationsISO 9001 · IATF 16949 · RoHS
Inside Our Facility

A 20,000 m² factory you can audit

200+ CNC machines, an in-house QC lab and a full finishing line — all under one roof in Dongguan.

Workshop Floor
CNC Production Lines
Drill & Tap Centers
5-Axis Machining
Vertical Machining Centers
Multi-Function Cells

Sourcing a Wholesale Precision CNC Machining 3C Parts Supplier
9 , October

Sourcing a Wholesale Precision CNC Machining 3C Parts Supplier

Learn how to source wholesale precision CNC machining for 3C electronics. Audit suppliers, control hidden costs, and scale OEM production efficiently.
Aluminum vs Titanium: Which Is Best for 3C Electronics
2 , October

Aluminum vs Titanium: Which Is Best for 3C Electronics

Compare Al6061, Al7075, and Ti-6Al-4V for 3C electronic accessories. Evaluate thermal conductivity, weight, strength, and CNC machining cost trade-offs.
Custom CNC Aluminum Audio Housings: Premium OEM Solutions
25 , September

Custom CNC Aluminum Audio Housings: Premium OEM Solutions

Custom aluminum audio housing manufacturing: High-precision CNC machining (±0.01mm), custom anodizing, and screen printing for premium audio hardware.

Got a Drawing? Get a Quote in 24 Hours.

Upload your CAD file. Our DFM engineer reviews manufacturability, flags issues and sends a detailed quote — free, no obligation. From prototype to 100,000-piece production runs.

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