... , Passivate, Oxidation, Phosphorization, Radiant PlatedStandardsJIS, ANSI, DIN, GB, ASME, BSW, ISOProcess Heading, Threading, Angle ... -slipping patchCategory we can process1. by componentsBolts, Screw bolts/Studs, Nuts, Tapping screws, Wooden screws ... Pan washer, Cheese, Countersunk, Fillister, hexagon, Hexagon washer head, Hexagon socket button head and etc.3. by ... com.cn Flat Round Washers JL-SCR-032