Deep groove ball bearings imported bearings is mainly used for pure under radial load, also can bear radial load and axial load at the same time. When its just pure under radial load, the contact Angle is zero. When the deep groove ball bearing with larger radial clearance, with the performance of angular contact bearings, can withstand a larger axial load. Deep groove ball bearing small friction coefficient, limit rotational speed is high, especially in axial load under high speed working condition, deep groove ball bearing is more superiority than thrust ball bearing. Deep groove ball bearing is the most representative of rolling bearings, the wide range of USES.