The dimensional and running accuracy of rolling bearings has been standardized internationally, For dimensional accuracy, these standards prescribe the tolerances necessary when installing bearings on shafts or in housings. Running accuracy is defined as the allowable limits for bearing runout during operation.
Tolerance symbols and definitions
Tolerance symbol |
Definition |
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d | Nominal bore diameter | ||||||||||
Δdmp | Deviation of mean bore diameter in a single plane | ||||||||||
Vdsp | Variation of single bore diameter in a single plane | ||||||||||
Vdmp | Variation of mean bore diameter | ||||||||||
D | Nominal outside diameter | ||||||||||
ΔDmp | Deviation of mean outside diameter in a single plane | ||||||||||
VDsp | Variation of single outside diameter in a single plane | ||||||||||
VDmp | Variation of mean outside diameter | ||||||||||
B | Nominal inner ring width | ||||||||||
ΔBs | Deviation of a single inner ring width | ||||||||||
VBs | Variation of inner ring width | ||||||||||
C | Nominal outer ring width | ||||||||||
ΔCs | Deviation of a single outer ring width | ||||||||||
VCs | Variation of outer ring width | ||||||||||
Kia | Radial runout of inner ring of assembled bearing | ||||||||||
Kea | Radial runout of outer ring of assembled bearing | ||||||||||
Sd | Runout of inner ring face to the bore | ||||||||||
SD | Runout of outer ring outside surface generatrix to the face | ||||||||||
Sia | Axial runout of inner ring of assembled bearing | ||||||||||
Sea | Axial runout of outer ring of assembled bearing |
Inner Ring |
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Grade | d | △dmp | △ds① | Vdp② | Vdmp | Kia | Sd | Sia | △Bs | Vbs | ||||||
Diameter Series | ||||||||||||||||
mm | 9 | 0,1 | 2,3,4 | |||||||||||||
over | incl | Max | Min | Max | Min | Max | Max | Max | Max | Max | Max | Min | Max | |||
ABEC1(P0) | 2.5 | 10 | 0 | -8 | 10 | 8 | 6 | 6 | 10 | 0 | -120 | 15 | ||||
10 | 18 | 0 | -8 | 10 | 8 | 6 | 6 | 10 | 0 | -120 | 20 | |||||
18 | 30 | 0 | -10 | 13 | 10 | 8 | 8 | 13 | 0 | -120 | 20 | |||||
30 | 50 | 0 | -12 | 15 | 12 | 9 | 9 | 15 | 0 | -120 | 20 | |||||
50 | 80 | 0 | -15 | 19 | 19 | 11 | 11 | 20 | 0 | -150 | 25 | |||||
80 | 120 | 0 | -20 | 25 | 25 | 15 | 15 | 25 | 0 | -200 | 25 | |||||
120 | 180 | 0 | -25 | 31 | 31 | 19 | 19 | 30 | 0 | -250 | 30 | |||||
ABEC3(P6) | 2.5 | 10 | 0 | -7 | 9 | 7 | 5 | 5 | 6 | 0 | -120 | 15 | ||||
10 | 18 | 0 | -7 | 9 | 7 | 5 | 5 | 7 | 0 | -120 | 20 | |||||
18 | 30 | 0 | -8 | 10 | 8 | 6 | 6 | 8 | 0 | -120 | 20 | |||||
30 | 50 | 0 | -10 | 13 | 10 | 8 | 8 | 10 | 0 | -120 | 20 | |||||
50 | 80 | 0 | -12 | 15 | 15 | 9 | 9 | 10 | 0 | -150 | 25 | |||||
80 | 120 | 0 | -15 | 19 | 19 | 11 | 11 | 13 | 0 | -200 | 25 | |||||
120 | 180 | 0 | -18 | 23 | 23 | 14 | 14 | 18 | 0 | -250 | 30 | |||||
ABEC5(P5) | 2.5 | 10 | 0 | -5 | 5 | 4 | 4 | 4 | 4 | 7 | 7 | 0 | -40 | 5 | ||
10 | 18 | 0 | -5 | 5 | 4 | 4 | 4 | 4 | 7 | 7 | 0 | -80 | 5 | |||
18 | 30 | 0 | -6 | 6 | 5 | 5 | 4 | 4 | 8 | 8 | 0 | -120 | 5 | |||
30 | 50 | 0 | -8 | 8 | 6 | 6 | 5 | 5 | 8 | 8 | 0 | -120 | 5 | |||
50 | 80 | 0 | -9 | 9 | 7 | 7 | 5 | 5 | 8 | 8 | 0 | -150 | 6 | |||
80 | 120 | 0 | -10 | 10 | 8 | 8 | 5 | 6 | 9 | 9 | 0 | -200 | 7 | |||
120 | 180 | 0 | -13 | 13 | 10 | 10 | 7 | 8 | 10 | 10 | 0 | -250 | 8 | |||
ABEC7(P4) | ||||||||||||||||
2.5 | 10 | 0 | -4 | 0 | -4 | 4 | 3 | 3 | 2 | 2.5 | 3 | 3 | 0 | -40 | 2.5 | |
10 | 18 | 0 | -4 | 0 | -4 | 4 | 3 | 3 | 2 | 2.5 | 3 | 3 | 0 | -80 | 2.5 | |
18 | 30 | 0 | -5 | 0 | -5 | 5 | 4 | 4 | 2.5 | 3 | 4 | 4 | 0 | -120 | 2.5 | |
30 | 50 | 0 | -6 | 0 | -6 | 6 | 5 | 5 | 3 | 4 | 4 | 4 | 0 | -120 | 3 | |
50 | 80 | 0 | -7 | 0 | -7 | 7 | 5 | 5 | 3.5 | 4 | 5 | 5 | 0 | -150 | 4 | |
80 | 120 | 0 | -8 | 0 | -8 | 8 | 6 | 6 | 4 | 5 | 5 | 5 | 0 | -200 | 4 | |
120 | 180 | -10 | 0 | -10 | 10 | 8 | 8 | 5 | 6 | 6 | 6 | 0 | -250 | 5 | ||
Marks:①Series 0,1,2,3,4 only | ||||||||||||||||
②Series 7,8 have no standard |
Outer Ring |
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Grade | D | △Dmp | △Ds① | VDp② | VDmp | Kea | SD | Sea | △Cs | Vcs | |||||||
Open | Close | ||||||||||||||||
Series | |||||||||||||||||
mm | 9 | 0,1 | 2,3,4 | 2,3,4 | |||||||||||||
over | incl | high | low | Max | Min | Max | Max | Max | Max | Max | Max | Min | Max | ||||
ABEC1(P0) | 2.5 | 6 | 0 | -8 | 10 | 8 | 6 | 10 | 6 | 15 | same as △Bs of inner ring | same as Vbs of inner ring | |||||
6 | 18 | 0 | -8 | 10 | 8 | 6 | 10 | 6 | 15 | ||||||||
18 | 30 | 0 | -9 | 12 | 9 | 7 | 12 | 7 | 15 | ||||||||
30 | 50 | 0 | -11 | 14 | 11 | 8 | 16 | 8 | 20 | ||||||||
50 | 80 | 0 | -13 | 16 | 13 | 10 | 20 | 10 | 25 | ||||||||
80 | 120 | 0 | -15 | 19 | 19 | 11 | 26 | 11 | 35 | ||||||||
120 | 150 | 0 | -18 | 23 | 23 | 14 | 30 | 14 | 40 | ||||||||
150 | 180 | 0 | -25 | 31 | 31 | 19 | 38 | 19 | 45 | ||||||||
180 | 250 | 0 | -30 | 38 | 38 | 23 | - | 23 | 50 | ||||||||
ABEC3(P6) | 2.5 | 6 | 0 | -7 | 9 | 7 | 5 | 9 | 5 | 8 | |||||||
6 | 18 | 0 | -7 | 9 | 7 | 5 | 9 | 5 | 8 | ||||||||
18 | 30 | 0 | -8 | 10 | 8 | 6 | 10 | 6 | 9 | ||||||||
30 | 50 | 0 | -9 | 11 | 9 | 7 | 13 | 7 | 10 | ||||||||
50 | 80 | 0 | -11 | 14 | 11 | 8 | 16 | 8 | 13 | ||||||||
80 | 120 | 0 | -13 | 16 | 16 | 10 | 20 | 10 | 18 | ||||||||
120 | 150 | 0 | -15 | 19 | 19 | 11 | 25 | 11 | 20 | ||||||||
150 | 180 | 0 | -18 | 23 | 23 | 14 | 30 | 14 | 23 | ||||||||
180 | 250 | 0 | -20 | 25 | 25 | 15 | - | 15 | 25 | ||||||||
ABEC5(P5) | 2.5 | 6 | 0 | -5 | 5 | 4 | 4 | 3 | 5 | 8 | 8 | 5 | |||||
6 | 18 | 0 | -5 | 5 | 4 | 4 | 3 | 5 | 8 | 8 | 5 | ||||||
18 | 30 | 0 | -6 | 6 | 5 | 5 | 3 | 6 | 8 | 8 | 5 | ||||||
30 | 50 | 0 | -7 | 7 | 5 | 5 | 4 | 7 | 8 | 8 | 5 | ||||||
50 | 80 | 0 | -9 | 9 | 7 | 7 | 5 | 8 | 8 | 10 | 6 | ||||||
80 | 120 | 0 | -10 | 10 | 8 | 8 | 5 | 10 | 9 | 11 | 8 | ||||||
120 | 150 | 0 | -11 | 11 | 8 | 8 | 6 | 11 | 10 | 13 | 8 | ||||||
150 | 180 | 0 | -13 | 13 | 10 | 10 | 7 | 13 | 10 | 14 | 8 | ||||||
180 | 250 | 0 | -15 | 15 | 11 | 11 | 8 | 15 | 11 | 15 | 10 | ||||||
ABEC7(P4) | 2.5 | 6 | 0 | -4 | 0 | -4 | 4 | 3 | 3 | 2 | 3 | 4 | 5 | 2.5 | |||
6 | 18 | 0 | -4 | 0 | -4 | 4 | 3 | 3 | 2 | 3 | 4 | 5 | 2.5 | ||||
18 | 30 | 0 | -5 | 0 | -5 | 5 | 4 | 4 | 2.5 | 4 | 4 | 5 | 2.5 | ||||
30 | 50 | 0 | -6 | 0 | -6 | 6 | 5 | 5 | 3 | 5 | 4 | 5 | 2.5 | ||||
50 | 80 | 0 | -7 | 0 | -7 | 7 | 5 | 5 | 3.5 | 5 | 4 | 5 | 3 | ||||
80 | 120 | 0 | -8 | 0 | -8 | 8 | 6 | 6 | 4 | 6 | 5 | 6 | 4 | ||||
120 | 150 | 0 | -9 | 0 | -9 | 9 | 7 | 7 | 5 | 7 | 5 | 7 | 5 | ||||
150 | 180 | 0 | -10 | 0 | -10 | 5 | 8 | 5 | 8 | 5 | |||||||
180 | 250 | 0 | -11 | 0 | -11 | 6 | 10 | 7 | 10 | 7 | |||||||
Marks:①Series 0,1,2,3,4 only | |||||||||||||||||
②Series 7,8 have no standard |
Chamfer dimensions. |
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rmin. Or r1min. |
Nominal bore diameter | Radial direction | Axial direction | |
d | ||||
mm | r max. or r1 max. | |||
over | up to | |||
0.05 | - | - | 0.1 | 0.2 |
0.08 | - | - | 0.16 | 0.3 |
0.1 | - | - | 0.2 | 0.4 |
0.15 | - | - | 0.3 | 0.6 |
0.2 | - | - | 0.5 | 0.8 |
0.3 | - | 40 | 0.6 | 1 |
40 | - | 0.8 | 1 | |
0.6 | - | 40 | 1 | 2 |
40 | - | 1.3 | 2 | |
1 | - | 50 | 1.5 | 3 |
50 | - | 1.9 | 3 | |
1.1 | - | 120 | 2 | 3.5 |
120 | - | 2.5 | 4 | |
1.5 | - | 120 | 2.3 | 4 |
120 | - | 3 | 5 | |
2 | - | 80 | 3 | 4.5 |
80 | 220 | 3.5 | 5 | |
220 | - | 3.8 | 6 |