China Thread Machining Manufacturer & Precision Custom Products

We machine all major international thread standards including ISO Metric (M), Unified National (UNC, UNF, UNEF, UNJ), National Pipe Thread (NPT, NPTF), British Standard Pipe (BSPP/G, BSPT/R), Acme, Stub Acme, Trapezoidal (Tr), Whitworth (BSW), and custom specialized non-standard thread pitches. We can also reverse-engineer physical samples into precise CAD drawings.

For standard CNC thread turning and milling, we routinely hold pitch diameter tolerances within ±0.01 mm (Class 6H/6g or Class 2A/2B). On precision Swiss-lathe turned parts and ground thread profiles, we can achieve tolerances down to ±0.005 mm (Class 4h6h or Class 3A/3B), verified via CMM and 3-wire measurement systems.

Galling is caused by high friction and cold welding of thread surfaces. We mitigate galling through precise cutter offset programming, burnishing tool paths, super-finishing thread flanks to Ra < 0.4 µm, and applying specialized surface treatments such as Nitriding, Passivation, MoS2 anti-friction coatings, DLC (Diamond-Like Carbon), or Silver/Cadmium plating.

- Thread Turning: Ideal for standard external/internal threads on turned rotational parts.
- Thread Milling: Best for blind holes, hard materials (HRC > 45), asymmetric housing blocks, and large diameters where tapping carries high breakage risk.
- Thread Whirling: Recommended for long slender screws (medical bone screws, lead screws) requiring high depth-to-diameter ratios without bending.
- Thread Rolling: Ideal for high-volume fasteners and dynamic shafts requiring superior fatigue resistance and smooth grain flow.

Every shipment can be accompanied by an ISO 9001 quality certificate, raw material chemical and physical mill test certificates (EN 10204 3.1), RoHS & REACH compliance declarations, 100% Go/No-Go thread gauge sign-off sheets, and CMM First Article Inspection (FAI) dimensional reports.

Rapid prototypes and DFM evaluation samples are typically completed within 3 to 7 working days. Standard production batches take approximately 2 to 3 weeks depending on quantity, heat treatment requirements, and surface finishing complexity. Expedited production slots are available upon request.

We take IP security very seriously. We sign legally binding Non-Disclosure Agreements (NDAs) prior to file submission. All 3D STEP/IGES and 2D CAD files are stored on secure, encrypted internal servers, and design access is restricted strictly to assigned project engineers.