General standard hex bolts with a six-sided head, available fully or partially threaded. Manufactured to DIN 933, GB 5783, ISO 4017 and related standards; sizes M4–M64 (M6–M36 commonly stocked) and lengths 8–300mm. Coarse and fine pitches are offered and external threads are supplied to 6g tolerance for compatibility with standard nuts.

Grades include 4.6, 4.8, 5.6, 8.8 and 10.9 (12.9 through the Changgu sub‑brand). Materials range from Q235 mild steel and carbon steels to alloy steels; stainless steel is available on request. Surface finishes: plain (black oxide), zinc plated (blue‑white/yellow), hot‑dip galvanized, Dacromet, color zinc and others. Inspection and material/test reports can be supplied on request — please confirm standard, size, grade and finish when ordering.