Deep groove ball bearing (GB/T 276 -- 1994) formerly known as single-row radial ball bearing is the most widely used type of rolling bearing.It is characterized by small frictional resistance and high rotating speed, and can be used on the machine parts which can bear radial load or combined load acting on both radial load and axial load, and also on the machine parts which can bear axial load, such as small power motor, automobile and tractor gearbox, machine tool gear box, general machine, tool, etc.