This product is used for automobile. We provide semi-finished products，then the co-operators provide rolling thread and surface treatment, etc.
The washer surface is quite broad after the cold forming, then washer surface is also needed to be bent with dentation.
The difficulty of the product is the washer size. It’s hard to shape.
The deformation is too large, so it’s easily cracked, and difficult to guarantee the size. Plus, the length of the product is relatively long, the requirement for verticality is very strict, so it is almost impossible to have a 100% pass rate.
