Flat Washer 1)Standard:DIN,ANSI,BS,JIS,GB 2)Size:M3- ... 3)Material:Steel,Stainless steel 4)Finish:Zinc,Black,Nickel Flat Washer1) Standard: DIN, BS, IFI, JIS, ISO,GB,ANSI,ASME ... , and machining, also CNC machine, can do OEM order. din9021 flat washer