1)Standard: DIN, IFI, JIS, ISO,GB,ANSI 2)Washers type:flat ,spring ,lock,star 3)Accept customization Specifications of Washers: 1 ... Standard: DIN, BS, IFI, JIS, ISO,GB,ANSI,ASME ... available: e.g. Spring washer, star washer, plain washer, lock washers etc.Other special washers please send us your requirments ...