Round nuts are often matched with stop washers for round nuts. When assembling, the inner tongue of the washer is inserted into the groove on the axis, while the outer tongue of the washer is embedded in the groove of the round nut, and the nut is locked. Often used as the axial fixing of rolling bearings. The thread specification is M10 *1~M200 *3 round nut.
Thread specification D = M16 *1.5, material 45 steel, hardness HRC35-45 after groove or all heat treatment, marking of round nut with surface oxidation: nut GB/T 812-88 M16 *1.5.