Flange nuts, also known as washer nuts, toothed nuts, hexagonal flange nuts, flange nuts, etc., are mostly used in pipe connections or workpieces that need to increase the contact surface of the nut. The fastening performance of flange nuts is much better than that of hexagonal nuts, so flange nuts are required to be used on many screws and bolts. Because one end of the flange has a toothed circular flange surface, it is widely used in the industrial field.