Angular contact thrust ball bearings are separable, i.e. the washers and ball and cage assemblies can be mounted independently of each other. Although originally designed to support the rotary tables of drilling rigs, they are also suitable for other applications.Browse Angular Contact Thrust Ball Bearings for Ball Screws - BST Type in the Bearing Corp catalog including Quadruple-Row Angular Contact Thrust Ball Bearings for Ball Screws,Triple-Row Angular Contact Thrust Ball Bearings for Ball S.starting torque of a angular contact thrust ball bearing is less than that of a roller bearing. The 2A-BST type incorporates the maximum possible number of small balls (compared with those of a standard bearing), has thicker inner and outer rings and a larger contact angle of 60˚. Thus, this type of bearing boasts greater axial rigidity.