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Bearing Tolerances I

Tolerance symbol Definition
Bore diameter d Nominal bore diameter
ds Single bore diameter
dmp 1.Bore diameter,arithmetrical mean of the largest and smallest single bore diameters in one plane

2.Diameter of the small end of a tapered bore,arithmetrical

ds Deviation of a single bore diameter form the nomainal △ds = ds – d
dmp Deviation of the mean bore diameter from the nomainal △dmp = dmp – d
Vdp Bore diameter variation;difference between the largest and smallest single bore diameters in one plane
Vdmp Bore diameter variation;difference between the largest and smallest mean bore diameter
d1 Nominal diameter at theroretical large end of a tapered bore
d1mp Diameter at theoretical large end of tapered bore;arithmetica mean of the largest and smallest single bore diameters
d1mp Deviation of the mean bore diameter at the theoretical large end of a tapered bore from the nominal
dimp = d1mp – d1
Outside diameter D Nominal outside diameter
Ds Single outside diameter
Dmp Outside diameter;arithmetical mean of the largest and smallest single outside diameters in one plane
Ds Deviation of a single outside diameter from the nominal
Ds = Dmp – D
Dmp Deviation of the mean outside diameter from the nominal
Dmp = Dmp – D
VDp Outside diameter variation;difference between the largest and smallest single outside diameters in one plane
Vdmp Outside diameter variation;difference between the largest and smallest mean outside diameters of one ring or washer
Chamfer. Limits rs Single chamfer diension
rsmin Smallest single chamfer diamension of rs,r1,r2,r3,r4
r1,r3 Radial direction chamfer dimensions
r2,r4 Axial direction chamfer dimensions
Width or height B,C Nominal width of inner ring and outer ring,respectively
Bs,Cs Single width of inner ring and outer ring,respectively
B1s,C1s Single width of inner ring and outer ring,respectively,of a bearing specially manufactured for paired mounting
Bs,△Cs etc. Deviation of single inner ring width or single outer ring width from the nominal
Bs = Bs – B,cs=Cs-C △B1s = B1s – B1,C1s = C1s – C1
VBs,VCs Ring width variation;difference bwtween the largest and smallest single widths of inner ring and of outer ring,respectively
T 1.Nominal width(abutment width) of tapered roller bearings;Distance bwtween inner ring(cone) back face and outer ring(cup) back face
2.Nominal height(H) of single direction thrust bearing(Except spherical roller thrust bearing,see T4)
T1 1.Nominal width of taper roller bearing,cone assembled with master cup
2.Nominal height(H1) of double direction thrust ball bearing with seating washer
T2 1.Nominal width of tapered roller bearing,cup assembled with master cone
2.Nominal height(H) of double direction thrust bearing
T3 Nominal height(H1) of double direction thrust ball bearing with seating washers
T4 Nominal height(H) of spherical roller thrust bearing
Ts 1. Deviation of effective width of tapered roller bearing from the nominal
2. Deviation of height of single direction thrust bearing from the nominal.(except spherical roller thrust bearing,see T4s)
T1s 1.Deviation of effective single width of cone from the nominal
2.Deviation of height of single direction thrust ball bearing with seating washer from the nominal
T2s 1.Deviation of effective single width of cup from the nominal
2.Deviation of height of double direction thrust bearing from the nominal
T3s Deviation of height of double direction thrust ball bearing with seating washers from the nominal
T4s Deviation of height of spherical roller thrust bearing from the nominal
Running accuracy Kia,Kea Radial runout of inner ring and outer ring,respectively,of assembled bearing
Sd Side face runout with reference to bore (of inner ring)
SD Outside inclination variation;variation in inclination of outside cylindrical surface to outer ring side face
Sia,Sea Axial runout of inner ring and outer ring,respectively,of assembled bearing
Si,Se Thickness variation,measured from middle of raceway to back(seating) face of shaft washer and of housing washer,respectively (Axial runout)

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