Based on the side face configuration, the angular contact

ball bearings for paired mounting can be divided into three

groups:

      1.Back-to-back arrangement:

      2.face-to-face arrangement:

      3.Tandem  arrangement:

    These bearings can carry the combination of axial load an

dradial load .  they can also  carry  the  pure  radial load only.

Except the tandem arrangement, all the other arrangements

can  carry  axial  loads  in  double  directions.  Normally ,  the

manufacturer shall choose the arrangements for the rings a

nd  the  balls  are in the  conditions of carrying axial pre-load ,

therefore improving the capacity and rigidity   of  the whole 

arrangement as one bearing unit.