

Bore diameter  d  Nominal bore diameter  
d_{s}  Single bore diameter  
d_{mp}  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} = d_{s} – d  
△_{dmp}  Deviation of the mean bore diameter from the nomainal △_{dmp} = d_{mp} – d  
V_{dp}  Bore diameter variation;difference between the largest and smallest single bore diameters in one plane  
V_{dmp}  Bore diameter variation;difference between the largest and smallest mean bore diameter  
d_{1}  Nominal diameter at theroretical large end of a tapered bore  
d_{1mp}  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} = d_{1mp} – d_{1} 

Outside diameter  D  Nominal outside diameter  
D_{s}  Single outside diameter  
D_{mp}  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} = D_{mp} – D 

△_{Dmp}  Deviation of the mean outside diameter from the nominal △_{Dmp} = D_{mp} – D 

V_{Dp}  Outside diameter variation;difference between the largest and smallest single outside diameters in one plane  
V_{dmp}  Outside diameter variation;difference between the largest and smallest mean outside diameters of one ring or washer  
Chamfer. Limits  r_{s}  Single chamfer diension  
r_{smin}  Smallest single chamfer diamension of r_{s},r_{1},r_{2},r_{3},r_{4}  
r_{1},r_{3}  Radial direction chamfer dimensions  
r_{2},r_{4}  Axial direction chamfer dimensions  
Width or height  B,C  Nominal width of inner ring and outer ring,respectively  
B_{s},C_{s}  Single width of inner ring and outer ring,respectively  
B_{1s},C_{1s}  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} = B_{s} – B,_{cs}=C_{s}C △_{B1s} = B_{1s} – B_{1},_{C1s} = C_{1s} – C_{1} 

V_{Bs},V_{Cs}  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 T_{4}) 

T_{1}  1.Nominal width of taper roller bearing,cone assembled with master cup 2.Nominal height(H_{1}) of double direction thrust ball bearing with seating washer 

T_{2}  1.Nominal width of tapered roller bearing,cup assembled with master cone 2.Nominal height(H) of double direction thrust bearing 

T_{3}  Nominal height(H_{1}) of double direction thrust ball bearing with seating washers  
T_{4}  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 T_{4s}) 

△_{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  K_{ia},K_{ea}  Radial runout of inner ring and outer ring,respectively,of assembled bearing  
S_{d}  Side face runout with reference to bore (of inner ring)  
S_{D}  Outside inclination variation;variation in inclination of outside cylindrical surface to outer ring side face  
S_{ia},S_{ea}  Axial runout of inner ring and outer ring,respectively,of assembled bearing  
S_{i},S_{e}  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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