The wheel nut is a special nut used to fix the outer wheel of the car. Because of the uncertainty of the car nut, there is no national standard for the car nut, but the general model is roughly the same as the ordinary hexagonal nut, and there are also various models between M12-M42. Compared with ordinary hexagonal nuts, hub nuts are generally thicker than hexagonal national standard nuts of the same specification, and generally have fine teeth, and the thread pitch is roughly 1.5 mm and 2.0 mm. Equilateral hexagon, but there will be a taper at one end of the nut, and some of the tapers will have a step to place the nylon washer for locking, and some have no steps on the side! And some wheel nuts have a flange in the tapered part, and generally there is a flange on the outside, and there will be a step inside to place a nylon washer, while the general hexagonal nut is tapered!