Wholesale Custom Machine Fastener Supplier & Factories

Cold heading forms fasteners through plastic deformation without cutting material. This preserves continuous grain flow along the head-to-shank junction, increasing structural tensile strength by up to 20-30% while reducing raw material waste to nearly zero. CNC machining is reserved for low-volume prototypes or extremely complex geometries with multiple diameter steps.

For screws with hardness exceeding 320 HV (such as Property Class 8.8, 10.9, 12.9, or case-hardened PT self-tapping fasteners), electroplating processes risk hydrogen absorption during acid pickling. We enforce mandatory de-embrittlement baking at 200°C–220°C for 4 to 8 hours within 4 hours post-plating, verified through sustained load stress-rupture validation tests.

Parts undergo high-resolution multi-camera optical inspection systems. Our vision inspection stations evaluate key characteristics including drive socket cross-recess depth, thread lead pitch, bent shanks, and flash under the head at high speed, ensuring batches meet defect rates under 50 PPM or down to near zero-defect standards.

Custom tooling fabrication (heading dies, punches, thread rolling dies) typically spans 7 to 10 working days. First-article samples with full CMM dimensional inspection reports are dispatched within 12 to 15 days. Full commercial mass production runs generally complete within 3 to 4 weeks after prototype sign-off.