... DIN6799, DIN471, DIN472, DIN125, etc. 3.Copper and copper alloy fasteners including retaining ring (1) beryllium ... copper saddle washers, beryllium copper internal and external teeth washers and other (2) toothed washer phosphor ... and other. The surface treatment is blue zinc, color zinc plating, mechanical galvanizing, Dacromet, nickel, black, phosphating, painting, quenching and tempering process ...