The structure of truck wheel bolts is very simple, which is composed of screw, nut and washer. According to the different screw structures, they can also be divided into single head bolts and stud bolts. Nowadays, most cars are single head bolts, and stud bolts are generally used in small and medium-sized trucks. There are two ways to install single head bolts. One is hub bolts + nuts. The bolts are fixed on the hub by interference fit, and then the wheels are fixed by nuts. Generally, Japanese and Korean cars are widely used, and the vast majority of trucks also use this method.