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Proper mounting practices eliminate unnecessary bearing damage during installation. Bearings should never be struck directly with a hammer or a drift. Even force should be applied over the entire bearing ring face. When fitting both rings simultaneously, pressure should be applied to both rings to avoid indentations in the raceway.
Interference fits require more care as the bearing has a smaller bore or a larger outside diameter than the mating part. Bearings with relatively small interference fits can be press fit at room temperature using a sleeve against the ring face. Bearings are frequently mounted by striking the sleeve with a hammer though a mechanical or hydraulic press apply a more uniform force.
When mounting a non-separable bearing a pad that distributes the fitting pressure evenly over the inner and outer rings should be used.
Heated Mounting
Bearings with large inner ring interference (and large bore bearings) require a higher force to mount at room temperature. Heating and thus expanding the inner ring facilitates mounting in such cases.
One method to heat bearings is to immerse them in hot oil. The bearings should not be brought into direct contact with the heating element. Another method for bearings including prelubricated sealed and shielded types, is by using a hot plate. The heat application in both cases needs to be uniform. It is better not to heat the inner ring during installation.
Outer Ring Fitting
For outer ring interference fits, the outer rings of small type bearings can be pressed in at room temperature. Installation of large interference fits and large size bearings is assisted by heating the housing or cooling the outer ring.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7238BDF NSK | 190 | 340 | 55 |
| 7238ADF NSK | 190 | 340 | 55 |