Single row angular contact ball bearings
When the bearings are heated, their bore diameter becomes larger and their width also expands. The larger bore diameter facilitates mounting. When cooling, their bore diameter contracts to obtain the necessary (interference) fit. Their width also contracts and a small gap between the bearings can result.
Super Precision Angular Contact bearings are designed for rigid, high speed, high tolerance applications. Spindle bearings used in pairs in a 'back to back' or 'face to face' arrangemet can support axial forces on both directions and moments.