Housing and Shaft
To ensure that the correct fit is achieved between the bearing
rings, shaft and housing seating, it is necessary to determine
the type of application and bearing selection. To do this
the following steps must be considered:
Determine whether the rotating load is inner ring, outer-ring
or indeterminate (rotating load conditions applying to both
rings). In each case the ring carrying the rotating load i.e.
any ring that carries the load, the total circumference of
the raceway each revolution must have an interference fit
with the housing or shaft. In general practice a bearing ring
carrying a stationary load has a transition or free fit.
Determine the need for axial displacement of the bearing.
The magnitude and type of load and the requirements regarding
accuracy of running.
The appropriate fit of the bearing for the shaft and housing
can then be determined by using the tables. These refer to
solid steel shafts and cast iron or steel housings and are
valid for a wide range of applications.