Interference Fitting and Clearance
Tedric A. Harris, Michael N. Kotzalas · 2006
Ball and roller bearings are usually mounted on shafts or in housings with interference fits. This is done to prevent fretting corrosion that could be produced by relative movement between the bearing inner-ring bore and the shaft O.D. or the bearing outer-ring O.D. and the housing bore. The interference fit of the bearing inner ring with the shaft is usually accomplished by pressing the former member over the latter. In some cases, however, the inner ring is heated to a controlled temperature in an oven or in an oil bath. Then, the inner ring is slipped over the shaft and allowed to cool, thus accomplishing a shrink fit.