First, the physical structure is different, as shown in Fig. In the above picture, the American standard pulley is on the left, and the European standard pulley is on the right. There is no difference, but if you look carefully, you will find that their physical structures are different. American standard pulley, nicknamed American standard expansion sleeve pulley, is divided into two parts: pulley and expansion sleeve; European standard pulley, the big name European standard taper sleeve pulley, is divided into two parts: pulley and taper sleeve. The expansion sleeve’s appearance differs from that of the taper sleeve. The tapered sleeve has a slope.
Secondly, the model names of the American standard pulley and European standard pulley are different. When purchasing a pulley, you need to know the pulley model in advance. Generally, American standard pulley models: are 3V, 5V, and 8V; European standard pulley models: are SPZ, SPA, SPB, and SPC.
Warm prompt: although American standard pulley and European standard pulley can be interchanged sometimes, it should be judged according to the actual situation and can not be selected blindly