... )Size:M3-M76 3)Material:Steel,Stainless steel The Flat Washer 1) Standard: DIN, BS, IFI, JIS, ISO,GB,ANSI,ASME ... ) Working Process Include: cold punching, and machining, also CNC machine, can do OEM order.10) Experience: we have over than 10 ... , 80% of our products are exported to oversea. DIN435 flat washer