Hub nuts are special nuts used to fix automobile outer hubs. Because of the uncertainty of automobile nuts, there is no national standard for automobile nuts, but the general type and the ordinary hexagonal nut are roughly the same. There are also various types in the middle of M12-M42. Compared with ordinary hexagonal nuts, hub nuts are generally thicker than hexagonal nuts of the same specifications, and generally have fine teeth, thread pitch is roughly 1.5 mm and 2.0 mm, shape and hexagonal nuts are equal hexagonal, but at one end of the nut there will be a taper, taper inside there will be a step to place nylon washer as a lock. Tighten up, some sides have no steps! And some hub nuts have a flange in the conical part, and generally there is a flange outside, there will be a step inside the nylon washer, and generally the hexagonal nut with a conical shape!