cup washer 1)Standard:DIN,ANSI,BS,JIS,GB 2)Size:M3- ... 3)Material:Steel,Stainless steel 4)Finish:Plain,Zinc,Black Cup Washer1) Standard: DIN, BS, IFI, JIS, ISO,GB,ANSI,ASME ... , Hot-dip Galvanizing.etc.5) Shape: round , square , curved , taper, cup, bowl or according to your request.6) Surface Condition: remove ... punching, and machining, also CNC machine, can do OEM order. cup washer