A complete process chain covering cold forming, thread processing, heat treatment, surface treatment and sorting inspection, supported by routine inspection capabilities, batch traceability and a complete delivery documentation system.
Supporting key characteristic validation and batch consistency control; specific items and acceptance criteria follow the technical agreement confirmed by both parties.
Routine mechanical tests such as hardness, tensile and yield, torque and breaking torque, and wedge loading.
Dimensional items such as thread accuracy, head dimensions, shank diameter and straightness.
Metallographic analyses such as material verification, decarburisation depth and microstructure.
Corrosion tests such as neutral salt spray, used to evaluate coating and surface treatment performance.
Drive torque, tapping performance and matched pilot hole validation for thread-forming screws.
Optical and eddy-current sorting to remove mixed material and crack-risk parts.
Integrated cold forming, thread processing, heat treatment and surface treatment, reducing quality variation and lead time loss from inter-plant transfers.
| Stage | Capability Notes |
|---|---|
| Cold Forming | Multi-station cold forming covering M2–M18 and lengths of approx. 2–160 mm; special heads and non-standard structures can be formed |
| Thread Processing | Thread rolling and thread-forming (Taptite type), supporting self-tapping, self-drilling and pre-applied adhesive anti-loosening designs |
| Heat Treatment | Continuous mesh-belt furnace heat treatment for property class adjustment and stress relief, with de-embrittlement process |
| Surface Treatment | Zinc plating, zinc-iron alloy, zinc-nickel, phosphating, Dacromet, etc., selected to corrosion resistance requirements |
| Sorting and Packaging | Packed by batch after optical / eddy-current sorting, with labels and traceability information |
Routine delivery documents such as material certificates, inspection reports and declarations of conformity, provided with each batch as agreed.
A complete traceability chain from wire batch to finished part packaging, supporting problem location and closed-loop resolution.
Dimensional and performance validation records are provided at the sample trial stage; volume production starts only after confirmation.
The manufacturing system covers automotive quality management system, quality management system and environmental management system certification, with key special processes passing process audits.
| Certification / Audit | Scope |
|---|---|
| IATF 16949:2016 | Automotive quality management system, covering fastener cold forming and related manufacturing processes |
| ISO 9001:2015 | Quality management system |
| ISO 14001:2015 | Environmental management system |
| Process Audit | Heat treatment (CQI-9) and plating (CQI-11) process audits passed multiple times |
Issued by the international certification body Bureau Veritas; certificate information is available for customer audit verification.
Heat treatment and plating are process-controlled and periodically audited to CQI-9 / CQI-11 requirements.
Supporting customer supplier audits and document verification, providing the required process and quality records.
Provide drawings and operating condition requirements, and we will deliver manufacturability review conclusions and process solution recommendations.
