Bearing tolerance measurement methods

Measurement methods for rolling bearing tolerances are in table below that shows some of the major methods of measuring rotation tolerances. Please refer to SKF bearing tolerances.

Rotation tolerance measurement methods
Characteristic tolerance Measurement method
Inner ring radial runout
(Kia)
Radial runout of the inner ring is the difference between the maximum and minimum reading of the measuring device when the inner ring is turned one revolution.
Outer ring radial runout
(Kea)
Radial runout of the outer ring is the difference between the maximum and minimum reading of the measuring device when the outer ring is turned one revolution.
Inner ring axial runout
(Sia)
Axial runout of the inner ring is the difference between the maximum and minimum reading of the measuring device when the inner ring is turned one revolution.
Outer ring axial runout
(Sea)
Axial runout of the outer ring is the difference between the maximum and minimum reading of the measuring device when the outer ring is turned one revolution.
Inner ring side
runout with bore
(Sd)
Inner ring side runout with bore is the difference between the maximum and minimum reading of the measuring device when the inner ring is turned one revolution together with the tapered mandrel.
Outer ring outside
surface inclination
(SD)
Outer ring outside surface inclination is the difference between the maximum and minimum reading of the measuring device when the outside ring is turned one revolution along the reinforcing plate.

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