Deep groove ball bearing (GB/T 276-2003) formerly known as single row centripetal ball bearing, is the most widely used kind of rolling bearing. It is characterized by small friction resistance, high speed, can be used to bear radial load or radial and axial simultaneous action of the combined load on the machine parts, can also be used to bear axial load on the machine parts, such as small power motor, car and tractor gearbox, machine tool gearbox, general machines, tools and so on.