Deep Groove Ball Bearings with simple structure, are easy to use and maintain. These bearing are mainly used to support radial load and a certain amount of axial load. If enlarged the radial internal clearance of these bearings, the bearings have the features of the angular contact ball bearings and can support a heavier axial load. These bearings have a less frictional resistance and a high limiting speed, so can operate satisfactorily under high-speed condition.