National Standard (GB) family of fasteners, including by Dang Quan axis, hole by Dang Quan, Dang Quan open, wave-washer, saddle-shaped washer, spring dish washers, spring washers, conical washers, washer teeth within and outside the teeth Washers, lock washers with jagged, sawtooth outside the lock washers, taper washers, stop ring, such as wire Dang Quan