Deep groove ball bearing general by a pair of rings, a group of keep frame, a group of steel ball composition. Its simple structure, easy to use, is the production of the most widely used the most common, a kind of bearings. This type of bearings are used to bear radial load, but also can bear a certain amount of any direction of the axial load. When within a certain range, the radial oil gap increase bearing, this kind of bearing has angular contact ball bearing the nature, can also withstand the larger axial load. Deep groove ball bearing installed in shaft later, can make the shaft or shell in the axial displacement axial bearing limit range. Meanwhile, when shell holes and axis (or outer circle) relatively more internal tilt, (according to pre-load sure) can still work normally. Since have tilt exist must reduce bearing service life.