1.A flat disk, as of metal, plastic, rubber, or leather, placed beneath a nut or at an axle bearing or a joint to relieve friction, prevent leakage, or distribute pressure.
2.The Venus tool factory of Wuxi is that the area of Wuxi produces the tool professional factory of whorl of the bicycle, sewing machine, standard machine.Our main products are short shank nut taps,flat dies,thread rolling cylindrical dies.
