Deep groove ball bearing is simple in structure and easy to achieve higher manufacturing accuracy compared with other types, so it is convenient for mass production in series and low in manufacturing cost, so it is widely used. In addition to the basic type, deep groove ball bearing also has various variant structures, such as: deep groove ball bearing with dust cover, deep groove ball bearing with rubber seal ring, deep groove ball bearing with stop groove, deep groove ball bearing with large load capacity with ball notch, double row deep groove ball bearing.