Deep Groove Roller Bearing Tolerances

Tolerances for rolling bearings, i.e., dimensional accuracy, running accuracy, etc., are regulated by standards such as JIS and ISO.

For dimensional accuracy, these standards specify the tolerance and permissible values for the boundary dimensions (bore diameter, outside diameter, width, assembled bearing width, chamfer and taper).

For machining accuracy, the standards provide permissible variation limits on bore, mean bore, outside diameter, mean outside diameter and ring width.

Rotational precision is defined as the permissible values for bearing runout.

Bearing runout tolerances are included in the standards for inner and outer ring radial & axial runout, inner ring side runout with bore, and outer ring surface runout with side.

Tolerances and permissible values are established for each tolerance grade or class.

A comparison of relative tolerance classifications between JIS B1514 standard classes and other standards is shown below.

Bearing Tolerance Classes

Deep Groove Ball Bearings Applicable Tolerance Classes
Equivalent standards (Reference)
JIS (1) Class 0 Class 6 Class 5 Class 4 Class 2
DIN (2) P 0 P 6 P 5 P 4 P 2
AFBMA (3) ABEC 1 ABEC 3 ABEC 5 (Class 5P) ABEC 7 (Class 7P) ABEC 9 (Class 9P)
Note:
(1) JIS: Japanese Industrial Standards
(2) DIS: Deutsche Industrie Norm
(3) AFBMA: Anti-Friction Bearing Manufacturer’s Association
Nominal Bore Diameter d (mm) Clearance
C 2 Normal C 3 C 4 C5
over incl over-incl over-incl over-incl over-incl over-incl
10 only   0-7 2-13 8-23 14-29 20-37
10 18 0-9 3-18 11-25 18-33 25-45
18 24 0-10 5-20 13-28 20-36 28-48
24 30 1-11 5-20 13-28 23-41 30-53
30 40 1-11 6-20 15-33 28-46 40-64
40 50 1-11 6-23 18-36 30-51 45-73

Radial Internal Clearances of Small and Miniature Bearings

Clearance Mark MC1 MC2 MC3 MC4 MC5 MC6
Clearance min-max min-max min-max min-max min-max min-max
0-5 3-8 5-10 8-13 13-20 20-28
Units: µm

Deep Groove Ball Bearings for Electric Motors

Nominal Bore Dia. d(mm) Clearance
CM
over-incl min-max
10(inch)-18 4-11
18-30 5-12
30-50 9-17
Units: µm

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