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,Non-Standard2 Size: M3–M763 Material: 1) Carbon Steel 2) Alloy Steel 3) Stainless Steel 4) Brass 5) Aluminum etc.4 Finish: 1) Zinc Clear 2) Zinc Yellow 3) Black 4) Nickel-plating 5) Tin-plating 6) Chrome- plating 7) ...