Super-Precision Contact Ball Bearings Mounting

Pressing bearing sets together during hot mounting

Super-precision angular contact ball bearings are typically used in sets. 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. This gap can negatively impact the preload in the bearing set. To avoid this, the bearing inner rings should be pressed against each other while cooling with an axial force that is slightly greater than the dismounting force. A force should never be applied directly or indirectly to the outer rings when pressing the bearings together.