Design of bearing arrangements

Abutment dimensions

Needle roller and cage assemblies should be guided axially by the fine turned and polished surfaces of adjacent machine components. For high-speed operations they should be hardened and ground. Appropriate abutment diameters are provided in table 1.
Interruptions in the surface of adjacent machine components should be avoided. Snap rings can be used in less demanding applications, otherwise an intermediate ring, e.g. a spring steel washer, should be mounted between the snap ring and the cage assembly.

Shaft and housing tolerances

The tolerances of raceways on shafts and in housings for needle roller and cage assemblies significantly influence the operating clearance of the bearing and, therefore, are provided under Operating clearance.
For additional information about raceways, refer to Raceways on shafts and in housings.

Paired mounting

If roller sets are to be mounted immediately adjacent to each other, the load should be shared equally by both roller sets. Therefore, needle roller and cage assemblies should incorporate rollers of the same gauge.
The deviation from the nominal dimensions of the fitted needle rollers is printed on the package.
For additional information about gauges, refer to Tolerances.
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