1) Washer's Standard: GB, BS, ANSI/ASMI, DIN, JIS 2) Washer's Material: 70#, 72B, 65Mn, SUS304, phosphor copper 3) Washer's Surface treatment: black, galvanized (blue, white, yellow), hot dipped galvanized 4) Other spring washer's specifications available according to customers' requirements Packing: According to customers' specifications