Angular contact bearings are constructed such that their races and the bearing balls contact points are at some angle relative to the axis of the operating axis of the bearing. Standard operating angles...

http://www.engineersedge.com/bearing/angular_contact_bearings.htm

To calculate the static load rating for Angular / Radial Contact Ball Bearings, use the following the equation:

http://www.engineersedge.com/bearing/static_load_rating_ball_bearings.htm