Bearing Accuracy&symbols

Tolerance

Symbol Definition

symbols

Bore diameter

d

Nominal bore diameter

d1

Nominal bore diameter

ds

Single bore diamete

Δdmp

1 Mean bore diameter; arithmetical mean of the largest and smallest single bore diameters in one plane
2 Mean diameter at the small end of a tapered bore; arithmetical mean of the largest and smallest single diameters

Δds

Deviation of a single bore diameter from the nominal (Δds = ds – d)

Δdmp

Deviation of the mean bore diameter from the nominal (Δdmp = dmp – d)

Δd1mp

Deviation of the mean bore diameter at the theoretical large end of a tapered bore from the nominal (Δd1mp = d1mp – d1)

Vdp

Bore diameter variation; difference between the largest and smallest single bore diameters in one plane

Vdmp

Mean bore diameter variation; difference between the largest and smallest mean bore diameters

Outside diameter

D

Nominal outside diameter

Ds

Single outside diameter

Dmp

Mean outside diameter; arithmetical mean of the largest and smallest single outside diameters in one plane

ΔDs

Deviation of a single outside diameter from the nominal (ΔDs = Ds – D)

ΔDmp

Deviation of a single outside diameter from the nominal (ΔDs = Ds – D)

VDp

Outside diameter variation; difference between the largest and smallest single outside diameters in one plane

VDmp

Mean outside diameter variation; difference between the largest and smallest mean outside diameters

Chamfer limits

rs

Chamfer limits

rs

min Smallest single chamfer dimension of rs, r1, r2, r3, r4 …

r1, r3

Radial direction chamfer dimensions

r2, r4

Radial direction chamfer dimensions

Width or height

B, C

Nominal width of an inner ring and outer ring, respectively

Bs, Cs

Nominal width of an inner ring and outer ring, respectively

B1s, C1s

Single width of an inner ring and outer ring, respectively, of a bearing specifically manufactured for paired mounting1)

ΔBs, ΔCs

Deviation of a single inner ring width or single outer ring width from the nominal (ΔBs = Bs – B; ΔCs = Cs – C)

ΔB1s, ΔC1s

Deviation of a single inner ring width or single outer ring width from the nominal (ΔBs = Bs – B; ΔCs = Cs – C)

VBs, VCs

Ring width variation; difference between the largest and smallest single widths of an inner ring and outer ring, respectively

T

Nominal height H of a thrust bearing

2C

Total nominal height of outer ring of a thrust bearing

Ts

Total nominal height of outer ring of a thrust bearing

ΔTs

Deviation of the height of a single direction thrust bearing from the nominal

ΔT2s

Deviation of the height of a double direction thrust bearing from the nominal

Hs

Single bearing height

H1s

Single cross section height

ΔHs

Deviation of a single bearing height

ΔH1s

Deviation of a single cross section height

Running accuracy

Kia, Kea

Radial run-out of an inner ring and outer ring, respectively, of an assembled bearing

Sd

Side face run-out with reference to the bore (of an inner ring)

SD

Outside inclination variation; variation in inclination of the outside cylindrical surface to the outer ring side face

Sia, Sea

Axial run-out of an inner ring and outer ring, respectively, of an assembled bearing

Si

Axial run-out of an inner ring and outer ring, respectively, of an assembled bearing

Se

Thickness variation, measured from the middle of the raceway to the back (seat) face of the housing washer (axial run-out)