... bolts, screws, nuts, machine screws, plain washers, spring lock washe rs, wood screws, tapping screws, drilling screws ... steel, alloy & stainless steel, aluminum, brass or other special materials. For finishing, we provide: black oxide, zinc ... or non-standard specifications or against our customers’ special requirements, in grades 4.8, 6.8, 8 ... you are welcome to visit us. SPRING LOCK WASHER