Deep groove ball bearings are the most representative, widely used. It is suitable for the operation of high speed and even the extremely high speed, and it is very durable, without the need to maintain frequently. This kind of bearing friction coefficient is small, extreme high speed, simple structure, low manufacturing cost, easy to manufacture high precision. The size range and variety of form, applied in the precision instrument, low noise motor, motor, motorcycle and general machinery industry, is the most widely used in the machinery industry a type of bearings. Mainly under the radial load, but also can bear a certain amount of axial load.