Ball and Roller Bearings - Ntn-snr.com

Bearing Tolerances
6.3 Bearing tolerance measurement methods
For reference, measurement methods for rolling bearing
tolerances are in JIS B 1515.
Table 6.12 shows some of the major methods of
measuring rotation tolerances.
Table 6.12 Rotation tolerance measurement methods
Characteristic tolerance
Measurement method
Inner ring radial runout
(K)
Measuring load
Measuring load
For inner ring radial runout,
record the total indicator
reading (TIR)
Outer ring radial runout
(K)
Measuring load
Measuring load
For outer ring radial runout,
record the total indicator reading
(TIR) after one revolution.
Measuring load
Measuring load
Inner ring axial runout
(S)
For inner ring axial runout,
record the total indicator reading
(TIR) after rotating the inner ring
one revolution.
Outer ring axial runout
(S)
Measuring load
Measuring load
For outer ring axial runout,
record the total indicator reading
(TIR) after rotating the inner ring
one revolution.
Inner ring side
runout with bore
(S)
For inner ring side runout with
bore, record the total indicator
reading (TIR) after rotating the
inner ring one revolution with a
tapered mandrel.
Outer ring outside
surface inclination
(S)
1.2rs max
1.2rs max
Reinforcing
plate
For outer ring outside surface
inclination, record the total
indicator reading (TIR) after
aligning the ring with the
reinforcing plate and rotating it
one revolution.
A-46