Deep groove ball bearing (GB / T 276-2003), formerly known as single row radial ball bearing, is one of the most widely used rolling bearings. It is characterized by small friction resistance and high speed. It can be used to bear radial load or combined radial and axial load at the same time. It can also be used to bear axial load, such as small power motor, automobile and tractor gearbox, machine tool gearbox, general machines, tools, etc.