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Design considerations

For general information, refer to Design considerations.

Abutment dimensions

Appropriate abutment diameters are listed in the product tables.

Recommendations for surfaces of adjacent machine components that guide the cage of needle roller bearings without flanges axially:

  • fine turned and polished
  • hardened and ground for high-speed operations
  • no interruptions
For less demanding applications, snap rings can be used, otherwise use an intermediate ring, e.g. a spring steel washer, to be mounted between the snap ring and the cage assembly.

Shaft and housing tolerances

Shaft and housing raceway tolerances for bearings without an inner ring
  • significantly influence the operating clearance of the bearing
  • are provided under Operating clearance

For additional information about raceways, refer to Raceways on shafts and in housings.

For needle roller bearings with machined inner and outer rings:

  • table 1 specifies suitable tolerance classes for the shaft
  • table 2 specifies recommended housing fits
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