In addition, we supply spring washers, wave spring washers GB7246-87, curved spring washers GB7245-87, heavy-duty spring washers GB7244-87, and single coil spring lock washer for assembly GB9074.26. Standards of GB, ANSI, BS, DIN, etc. in diameter from F2 to F30 are available. Materials: 65M, #70, stainless steel and copper phosphorus. They are applied to areas such as electrical appliance, automobiles, motorcycle assembly, screws, etc.