The square shaft is usually used with parts with internal square holes, which enables tight connection and stable torque transfer. The matching accuracy depends on the specific application scenario. In the occasions with high transmission accuracy requirements, such as precision instruments and equipment, high matching accuracy will be adopted, and the dimensional tolerance of the shaft and hole will be strictly controlled to ensure the uniform clearance after assembly and achieve accurate transmission. In some occasions with relatively low accuracy requirements, such as the rotating parts of ordinary furniture, the precision can be appropriately relaxed. In addition, the square shaft may also be matched with bearings, nuts, keys and other parts, bearings are used to support the shaft, reducing friction and wear during rotation; The nut can be used to fix the shaft axially; The key further enhances the torque transfer ability between the shaft and the hub and other parts, ensuring the stable operation of the entire transmission system.
