1.The
Pull Stud's thread hardness is a little low,30-40HRC(Protect shank thread,core hardness can tesist hit)
2.Cryogenic treatment and thermal aging treatment can reduce the inner tesidual stress,improve durability and precision stability.
3.Appearance Electroless plating process improve surface hardness durability ,cleanness,precision stability ,the surface is more smooth,anti-rust and anti-corrosion is better ,feel comfortable and surface is more nice .
4.Material is 20CrMnTi,the Carbon depth>0.8,the hardness is 57-57HRC
