CNC Machined Parts: What Buyers Should Know
CNC machined parts are precision components made by CNC turning and milling from metals and plastics, used across automotive, medical devices, robotics, and aerospace. Buyers source from China CNC machined parts manufacturers for tight tolerances, fast turnaround, and competitive pricing on custom components.
The key specifications are tolerance, material grade, surface finish, and quality control such as CMM inspection and ISO 9001. The curated suppliers below are screened against these criteria.
Curated Suppliers — CNC Machined Parts
7 Checks Before Choosing a CNC Machined Parts Supplier
1. Tolerance
Confirm achievable tolerance (commonly ±0.01mm or tighter) against your drawing.
2. Material
Specify aluminum, steel, stainless, brass, or engineering plastics with grade.
3. Surface finish
Clarify anodizing, plating, or polishing requirements early.
4. Inspection
Ask for CMM reports or first-article inspection for critical dimensions.
5. Prototyping
Verify rapid prototyping and low-volume capability before scaling.
6. Drawing format
Provide STEP/IGES or 2D drawings with GD&T for accurate quoting.
7. Certification
Confirm ISO 9001 and material certificates for regulated industries.
Frequently Asked Questions
What tolerance can Chinese CNC shops hold?
Most shops hold ±0.01mm routinely, with tighter tolerances possible on request for critical features.
What materials can be CNC machined?
Common materials include aluminum, stainless steel, brass, and engineering plastics like POM and PEEK.
What is the typical lead time for CNC parts?
Prototypes often ship in 5-10 days, while production orders depend on quantity and complexity.
Can Chinese factories handle small orders?
Yes, many offer low-volume and prototype runs, though unit price falls with higher quantities.