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Accuracy of Rolling Bearings 
  • Dimensional Accuracy 
    • Tolerances for bore & Outside diameters, ring & bearing width. 
    • Tolerances for inscribed & circumscribed circle diameters of rollers. 
    • Tolerances for chamfer dimensions. 
    • Tolerances for width variation. 
    • Tolerances for tapered bore diameters. 
  • Running Accuracy 
    • Permissible radial runout of inner and outer rings. 
    • Permissible face runout with raceway inner and outer rings. 
    • Permissible inner ring face runout with bore. 
    • Permissible outer ring variation of outside surface generatrix inclination with face. 

      • Permissible raceway to back face thickness variation of thrust bearings. 
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Equivalent Standard of Ball Bearing Tolerances
 
AFBMA *  ABEC-1  ABEC-3  ABEC-5  ABEC-7  ABEC-9 
JIS **  Class 0  Class 6  Class 5  Class 4  Class 2 
DIN ***  P 0  P 6  P 5  P 4  P 2 
 
* AFBMA: Anti-Friction Bearing Manufacturers Association 
** JIS: Japanese Industrial Standards 
*** DIN: Deutsch Industrie Norm
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Standard ABEC Tolerances

Inner Rings (all tolerances in micrometers) 
Bearing
Bore
(mm) 		 Bore Diameter*
+.00mm to 		 Width
Variation 		 Radial
Runout 		 Side Runout
with Bore 		 Raceway
Runout
with Side 		 Width Inner
&
Outer Rings 
ABEC  ABEC  ABEC  ABEC  ABEC  ABEC 
1  3  5  7  9  3  5  7  9  1  3  5  7  9  3  5  7  9  3  5  7  9  1-3-5-7  9 
0 - 10  -3  -2  -2  -1.5  -1  3  2  1  .5  3  2  1.5  1  .5  3  3  1  .5  6  3  1  .5  -50.  -10. 
10 - 18  -3  -2  -2  -1.5  -1  4  2  1  .5  4  3  1.5  1  .5  4  3  1  .5  6  3  1  .5  -50.  -20. 
* D(min) (the smallest single diameter of a bore) and D(max) (the largest single diameter of a bore)
may fall outside limits shown. [D(min)+D(max)]/2 will be within bore diameters tabulated.
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Standard ABEC Tolerances 

Outer Rings (all tolerances in micrometers) 
Bearing
O.D.
(mm) 		 Outside Diameter*
+.00mm to 		 Width
Variation 		 Radial
Runout 		 Raceway
Runout
with Side 		 Outside
Diameter
Runout with
Side 
ABEC  ABEC  ABEC  ABEC  ABEC 
1  3  5  7  9  3  5  7  9  1  3  5  7  9  3  5  7  9  3  5  7  9 
0 - 18  -4  -3  -2  -2  -1  4  2  1  .5  6  4  2  1.5  .5  8  3  2  .5  4  3  1.5  .5 
18 - 30  -4  -3  -2  -2  -1.5  4  2  1  .5  6  4  2  1.5  1  8  3  2  1  4  3  1.5  .5 
 
* D(min) (the smallest single diameter of an O.D.) and D(max) (the largest single diameter of an O.D.)
may fall outside limits shown. [D(min)+D(max)]/2 will be within outside diameters tabulated.
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