CNC machining in progress at Rejin CNC precision parts factory

Case Studies

Automotive & EV CNC Parts & Components — Precision Case Studies

Hand-picked Automotive & EV CNC Parts & Components projects: precision CNC machined parts for global OEMs, held to ±0.005mm, backed by ISO 9001 & IATF 16949, with 24h DFM quotes from prototype to volume.

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Case Studies

500K+

Parts Shipped / Year

50+

Countries Served

23+

Years Expertise

ISO 9001 & IATF 16949Certified quality system

±0.005mmAchievable tolerance

200+ CNC MachinesIn-house capacity

CMM InspectionFull dimensional report

Automotive & EV CNC Parts & Components CASE 1

Automotive & EV CNC Parts & Components

Auto Parts Project – Stainless Steel Connector Assembly for Vehicle Fluid Systems

AISI 304 stainless steel connector assemblies with integrated threads and stepped sealing shoulders - pressure-cycle tested, thread plug-gauge verified, first batch cleared for field use.

Why Rejin CNC

Engineering Trust Into Every Part

What global OEM buyers rely on when they place precision CNC work with us.

24h DFM & Quote

Send your drawings and get design-for-manufacturing feedback with a competitive quote within one business day.

No MOQ, From 1 Piece

Start with a single prototype to validate your design, then scale to mass production with the same tolerances and quality control.

NDA & IP Protection

Your drawings and designs stay confidential. We sign NDAs upfront and keep all project data on a closed internal network.

In-house Finishing

Anodizing, plating, powder coating, bead blasting and laser marking under one roof for faster lead times and consistent quality.

FAQ

Frequently Asked Questions

Everything you need to know about working with Rejin CNC for precision machining projects.

Technical & Quality

What machining tolerance can your CNC manufacturing reach?+

Our stable machining tolerance ranges from ±0.005 mm to ±0.01 mm for precision metal components. Strict dimensional inspection is conducted for all finished parts to meet tight precision requirements of automotive, drone and audio equipment industries.

What materials are applicable for CNC precision machining?+

We process various metals: aluminum alloys, stainless steel, carbon steel, brass, copper and titanium alloy. Different engineering plastics are also available according to your actual usage demands.

What custom machining services can you provide?+

We integrate full-set precision manufacturing services: 3/5-axis CNC milling, CNC turning, sheet metal fabrication, professional surface finishing and DFM design consulting, covering prototype development and large-volume OEM batch production.

Can you sign an NDA before we share drawings?+

Absolutely. We sign NDAs routinely and can use your template or provide ours. All project data stays on our internal network.

What inspection documents do you provide?+

Standard: material mill certs, dimensional inspection report, and COC. On request: full FAI, SPC data, CMM raw data, RoHS/REACH declarations, PPAP, IMDS.

Ordering & Process

What's the minimum order quantity for CNC machining?+

We handle prototype runs from 1 piece up to high-volume production of 50,000+ parts per month. Our sweet spot is 50–50,000 parts per order.

Do you offer DFM design assistance and rapid prototyping services?+

Yes. We provide free DFM manufacturability analysis for all submitted CAD drawings to optimize structure, reduce production costs and avoid processing defects. We also support fast prototyping for CNC turned, milled, 5-axis and sheet metal parts to verify appearance and assembly performance before mass production.

How long does quoting and prototyping take?+

Quotes with DfM feedback come back within 24 hours on business days. Prototyping typically takes 7–15 days depending on complexity.

Can I track my order production status online?+

Absolutely. Our sales team will regularly update production progress including raw material preparation, machining, surface treatment and final inspection. You can inquire about order details anytime via email or WhatsApp throughout the whole production cycle.

What payment terms do you accept for OEM orders?+

We support flexible international payment methods including T/T bank transfer, Western Union and PayPal. For long-term bulk cooperation clients, negotiable payment terms are available upon discussion.

What is the ordering process for custom metal parts?+

1. Send us your 2D/3D CAD drawings and detailed requirements. 2. We conduct DFM review and send you an official quotation within 24 hours. 3. Confirm order details and arrange payment. 4. Arrange prototyping and mass production step by step. 5. Complete full quality inspection and arrange delivery.

SIMPLE PROCESS

What Happens After You Click Send?

Inquiry Received

Your message lands directly with our senior engineers — instantly acknowledged.

Engineer Review

We study your requirements and propose a workable solution with material & process options.

Quote Within 24h

Detailed quotation with specs, options and lead time — no hidden fees.

Sample & Production

Approve the sample, then we mass-produce with full QC and on-time shipping.

WhatsApp: +86 18362358467

Email: info@rejincnc.com

Request a Quote

Custom Quote Within 24 Hours

Your CAD files are kept strictly confidential. Quotation within 24 hours.

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