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Bearing data

Dimension
standards
Boundary dimensions: ISO 15:2011

Except for:
  • outer ring width of NNF 50 series bearings:
    C = 1 mm smaller than ISO standard
  • bearings in the 3194.. series:
    dimensions not standardized
Tolerances

For additional
information
(→ Tolerances)
Normal

Values: ISO 492:2014 (table 1)
Radial internal
clearance


For additional
information
(→ Bearing internal clearance)
Normal, C3
Check availability of other clearance classes

Values: ISO 5753-1:2009 (table 2)
Values are valid for unmounted bearings under zero measuring load.
Axial internal
clearance


For additional
information
(→ Bearing internal clearance)
NNC and NNF designs: 0,1 to 0,2 mm
MisalignmentAngular misalignment between the inner and outer rings produces moment loads in the bearing. Any misalignment increases bearing noise and reduces bearing service life.
Axial displacement
Bearings having no flange on either the inner or outer ring, or only one integral flange on the inner or outer ring can accommodate axial displacement of the shaft relative to the housing within certain limits (→ product table). During operation, axial displacement occurs within the bearing and not between the bearing and shaft or housing bore. As a result, there is virtually no increase in friction.
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