SCM435 alloy steel wire, cold heading machine molding, surface roughness is Ra3.2, tolerance +/-0.15.

After 12.9 grade heat treatment (HRC39~44 ℃).

The surface treatment is trivalent blue and white zinc, no red embroidery above 96H salt spray.

Tiansheng has been specializing in non-standard customized fasteners for 12 years. Welcome to visit, guide and customize your products.