... heavy machinery Phillips screws which made of stainless steel :1.10 years experience of screws production 2.OEM ... SUS302,SUS304,SUS316,copper, carbon steel 5.Screw machine a minimum controllable tolerance: +/-0.02mm6.Screw machine a processing ... hollow rivet machine and test equipment8.Screw machine a process: nickel plating,Zinc plating, coating, Chrome plating, Passivation, brass plating9. Passed ...