Adopt 1022 high carbon steel wire, cold heading machine forming.
After that, it shall undergo 12.9 grade heat treatment (HRC39~44 ℃).
The surface treatment is trivalent black zinc, salt spray up to 144H above.
Dongguan Tiansheng Co., LTD has been specialized in developing and producing non-standard fasteners for 12 years.
You are welcome to customize different head type/length/surface treatment and similar products by drawing/sample.
