Deep Groove Ball Bearings, they have the most typical structure among rolling bearings and have widely usages. This type of bearings can carry not only radial load but also axial load in two directions. Featured with small friction torque, deep groove ball bearings are quite suitable for the circumstances that need high revolution speed, low noise, and slight vibration. Meantime, deep groove ball bearings are widely used in the fields like auto, electric, instruments, construction machinery, agriculture machinery and many kinds of special machinery. These bearings, with various specifications, are usually divided into open type and sealed type.