Page 51 - Rollingbearings

Tolerance symbols
Table 13
Tolerance symbols
Tolerance symbol Deinition

Radial bearings inner ring – cylindrical and tapered bore

d 1 Cylindrical bore: Nominal bore diameter
2 Tapered bore: Nominal bore diameter at the theoretical small end
Δdmp 1 Cylindrical bore: Deviation of a mid-range size (out of two-point sizes) of bore diameter in any cross section from its nominal size
2 Tapered bore: Deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical small end from its nominal
size

Δds Deviation of a two-point size of bore diameter of a cylindrical bore from its nominal size
Tolerances
Vdsp Range of two-point sizes of bore diameter in any cross section of a cylindrical or tapered bore
Vdmp Range of mid-range sizes (out of two-point sizes) of bore diameter obtained from any cross section of a cylindrical bore
B Nominal inner ring width
A.2
ΔBs 1 Symmetrical rings: Deviation of a two-point size of inner ring width from its nominal size
Nomal, 2 Asymmetrical rings, upper limit: Deviation of a minimum circumscribed size of inner ring width, between two opposite lines, in
Modiied 1) any longitudinal section which includes the inner ring bore axis, from its nominal size
3 Asymmetrical rings, lower limit: Deviation of a two-point size of inner ring width from its nominal size
VBs 1 Symmetrical rings: Range of two-point sizes of inner ring width
2 Asymmetrical rings: Range of minimum circumscribed sizes of inner ring width, between two opposite lines, obtained from any
longitudinal section which includes the inner ring bore axis
Kia 2) Circular radial run-out of inner ring bore surface of assembled bearing with respect to datum, i.e. axis, established from the outer
ring outside surface
Sd 2) Circular axial run-out of inner ring face with respect to datum, i.e. axis, established from the inner ring bore surface

Sia 2) Circular axial run-out of inner ring face of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside
surface

Radial bearings inner ring – tapered bore only

d 1 Nominal bore diameter at the theoretical large end of a tapered bore
Δd1mp Deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical large end from its nominal size

SL Taper slope, the difference between nominal diameters at the theoretical large end and small end of a tapered bore (d 1 – d)
ΔSL Deviation of taper slope of a tapered inner ring bore from its nominal size

1) Modiied applies to inner rings and outer rings of bearings of matched bearing sets consisting of two or more bearings. Does not apply to universally matchable angular contact ball bearings.
2) Geometrical tolerances

49