1)Standard: DIN, IFI, JIS, ISO,GB,ANSI 2)Washers type:flat ,spring ,lock,star 3)Accept customization Specifications of Washers: ... - plating 7) Dacromet 8) Mechanical Galvanizing 9) Hot-dip Galvanizing5 Type 1) Spring washers 2) Flat washers(plain washer,IFI,ASTM ...