This product adopts high carbon steel wire, cold heading forming, heat treatment HRC39~44 ℃, 12.9 grade bolts.
Surface treatment of ordinary color zinc, zinc coating passivation, usually depending on the use of different passivation solution and get different color passivation film or white passivation film.
Tiansheng professional non-standard research and development production of 12 fasteners, you are welcome to visit the guidance.
Can be customized by drawing/sample.
