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. Its characteristics are small friction resistance, high speed, can be used to bear radial load or radial and axial combined load on the parts, can also be used to bear axial load on the parts, such as low-power motors, automobile and tractor gearboxes, machine tool gearboxes, general machines, tools, etc..