Tolerance


Symbols & Definitions
The symbols used in this section are in accordance with ISO recommendations and they are defined as Inner rings
d
the nominal bore diameter
dmp
the arithmetical mean of the largest and smallest actual single diameters of a bore in a single radial plane
ds
a single diameter of a bore
∆dmp
the deviation of the mean bore diameter in a single plane =  Dmp-D
∆ds
the deviation of a single bore diameter =  ds-d
Kia
the radial runout of an assembled bearing inner ring relative to a fixed point on the bearing outer ring, both inner and outer"raceways being in contact with the rolling elements at the relevant angular position of measurement
Outer rings
D
the nominal outside diameter
Dmp
the arithmetical mean of the largest and smallest actual single outside diameters in a single radial plane
Ds
a single outside diameter
∆Dmp
the deviation of the mean outside diameter in a single plane =  Dmp-D
∆Ds
the deviation of a single outside diameter =  Ds-D
Kea
the radial run out of an assembled bearing outer ring relative to a fixed point on the bearing inner ring, both inner and outer raceways being in contact with the rolling elements at the relevant angular position of measurement
Ring widths
radial and angular contact bearings
B
the nominal inner ring width
C
the nominal outer ring width
Bs
a single inner ring width
Cs
a single outer ring width
∆Bs
the deviation of a single inner ring width Bs-B
∆Cs
the deviation of a single outer ring width =  Cs-C
VBs
the inner ring width variation =  the difference between the largest and smallest actual single widths of an inner ring
Vcs
the outer ring width variation
Thrust ball bearings
T
the nominal height of an. assembled bearing
Tm
the "bearing height deviation =  Tm-T
∆Tm
the actual height of an assembled bearing
Si
the shaft washer raceway runout relative to the flat seat face
Se
the housing washer raceway runout relative to the flat seat face