Precision Machining Service High-Tolerance Custom Metal Parts for Industrial OEMs

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Procurement professionals, mechanical engineers, and OEM buyers — when you search for "precision machining" or "custom metal parts", you need a partner who delivers high-tolerance components, consistent quality, and flexible volumes. With 12+ years of CNC precision machining experience, we specialize in producing custom metal parts using advanced 5‑axis milling, Swiss turning, and grinding — all under one roof. Tolerances as tight as ±0.002mm.

💡 One‑stop advantage: From prototype to bulk production (10 to 100,000+ units). Lead times: 3–6 days for prototypes, 10–20 days for volume orders. 99% on‑time delivery.

⚙️ Precision Machining: Our Core High‑Tolerance Manufacturing

We operate 32 high-performance CNC machines including 5‑axis mills, Swiss-type lathes, and grinders. Materials: aluminum, stainless steel, carbon steel, brass, copper, titanium, and nickel alloys (Inconel, Monel). Achievable tolerances: ±0.002mm for critical features.

🎯 Capabilities

  • 5‑axis simultaneous milling
  • Swiss turning (diameter 0.5–32mm)
  • Grinding, drilling, tapping
  • Polishing & surface finishing

📦 Scale & Speed

  • Prototypes: 1–100 units in 3–6 days
  • Mid‑volume: 1,000–10,000 units
  • Bulk: 100,000+ units in 10–20 days
  • Rush services available

🔧 Custom Metal Parts: Tailored to Your Exact Specifications

Our precision machining process produces a wide range of custom metal parts: brackets, housings, shafts, pins, bushings, gears, connectors, and more. We work directly from your CAD files (STEP, IGES, PDF) and offer complementary services: anodizing, plating, polishing, heat treatment, and assembly.

Design optimization support: Our engineers help refine designs for manufacturability, material selection, and tolerance stack‑ups — reducing costs and improving performance.

📌 Real‑World Case Study: Automotive Transmission Components

🏭 Customer: Tier‑1 automotive supplier
⚙️ Challenge: 12,000 custom metal parts (stainless steel) with ±0.005mm tolerance, 14‑day deadline.
✅ Our solution: Optimized CNC programs, in‑process CMM inspections, high‑grade stainless steel sourcing.
📊 Results: Delivered 1 day early, 0% defect rate. Client extended partnership to multiple precision machining projects.

🏆 Why Global OEMs Trust Us – Our LEGEND Commitment

🎯 12+ Years
📦 120,000+ Parts
🌍 40+ Countries
✅ 99% On‑Time Delivery
  • Experience & Expertise: 18 certified machinists, 5 senior engineers, deep knowledge of high‑tolerance materials.
  • Authoritativeness: ISO 9001:2015, IATF 16949 (automotive), AS9100D (aerospace), ISO 13485 (medical). Full in‑house CMM, surface roughness testers, tolerance gauges.
  • Trustworthiness: 100% quality guarantee – free rework or replacement. Real‑time order tracking, photos, and reports. 97% customer retention rate.

📏 Technical Capability Table: Precision Machining of Custom Metal Parts

Material Typical Tolerance (mm) Surface Roughness (Ra) Min. Feature Size Max Part Size
Stainless steel (303, 304, 316, 17‑4) ±0.002 – 0.01 Ra 0.2 – 0.8μm 0.5mm 800×600×300mm
Aluminum (6061, 7075, 2024) ±0.005 – 0.02 Ra 0.4 – 1.6μm 0.8mm 1000×800×400mm
Titanium (Grade 5, Ti‑6Al‑4V) ±0.005 – 0.015 Ra 0.4 – 1.2μm 0.8mm 600×400×200mm
Nickel alloys (Inconel 718, Monel) ±0.01 – 0.025 Ra 0.8 – 1.6μm 1.0mm 500×400×200mm
Brass / Copper ±0.005 – 0.01 Ra 0.2 – 0.8μm 0.5mm 600×500×300mm

* Tolerances may vary with part geometry and material; our engineers provide a DFM analysis with every quote.

❓ Frequently Asked Questions

🔹 What is the smallest feature you can machine?
We can machine features down to 0.5mm (holes, slots, radii) on metals. For Swiss turning, minimum diameter is 0.3mm.
🔹 Do you provide full inspection reports?
Yes. Each batch includes a material certificate and a dimensional report. CMM, surface roughness, and tolerance gauge data are available. FAIR (First Article) upon request.
🔹 Can you handle both prototyping and mass production?
Absolutely. We specialize in seamless scale‑up: from 1 prototype to 100,000+ production units with the same quality standards.
🔹 What CAD formats do you accept?
STEP (.stp), IGES (.igs), SolidWorks (.sldprt), and PDF drawings with tolerances noted.

🚀 Get Your Free Precision Machining Quote + Sample Testing

Send your CAD drawing to engineering@precisioncnc.com or complete the form below

Engineering review within 24h | Free sample testing available for new clients

🎯 Ready to source high‑tolerance custom metal parts? Stop coordinating multiple suppliers. Get precision machining, quality assurance, and on‑time delivery from a single trusted partner. Email: info@legend-mfg.com or call +86-189-2451-7393.

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