The deep groove ball bearings have simple structure and easy to use, also, the application scope is broad. Such bearings are mainly used to bear the radial load, also can bear the axial load.when the radial clearance is increasing,it can have the performance of angular contact ball bearings,and can bear the larger axial load. Compare to the other bearings of the same dimensions, the friction loss of the bearing is minimum and the limit speed is maximum. When under higher speed ,the thrust ball bearings can not be used,while, the deep groove ball bearings should be adopted to bear pure axial load.

Most of the cages of  deep groove ball bearing are pressed steel plate cage,but large bearings use machined solid cage.

Angular contact ball bearing have high limit rotational speed, they can carry radial load and axial load simultaneously, they cal also withstand purely radial load. The axial load carrying capacity depends on the magnitude of contact angle and increases with increasing contact angle.

This type of bearings is separable bearings. Whereof, QJ000 type has two-piece inner ring and QJF000 type has two-piece outer ring. Their contact angles are same as 35°. When received no load or pure radial load, the steel balls of the ball bearing contact with the four points of the rings. Besides the steel balls perform a two-point contact with the ring when it is received a pure axial load. In addition, besides the axial load from both directions, this kind of bearing can take torque-load as well.