Deep groove ball bearing (GB / T 276-2003), formerly single row radial ball bearing, is the most widely used rolling bearing. It is characterized by small friction resistance and high rotation speed. It can be used for parts bearing radial load or combined load of radial and axial simultaneously, and also for parts bearing axial load, such as small power motor, gearbox of automobile and tractor, gearbox of machine tool, general machine, tool, etc.