There are stipulations to the roller bearing major size allowable tolerance, admittance value, rotating precision in the National Standard of GB3.7.1. the following is a comparison table between these admissions and ISO, JIS Standards:
Standard allowable tolerance grades
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Class4
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Class2
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ABEC7
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ABEC9
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| TOLERANCE CLASS ABEC-1 |
| INNER RING |
Tolerance in um |
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d
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^dmp
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Vdp2)
|
Vdmp
|
Kia
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^Bs
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VBs
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Diameter Series
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mm
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9
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0,1
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2,3,4
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over
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incl.
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high
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low
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max.
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max.
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max.
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high
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low
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max.
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1)0.6
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2.5
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0
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-8
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10
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8
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6
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6
|
10
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0
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-40
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12
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2.5
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10
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0
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-8
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10
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8
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6
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6
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10
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0
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-120
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15
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10
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18
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0
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-8
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10
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8
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6
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6
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10
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0
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-120
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20
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18
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30
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0
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-10
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13
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10
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8
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8
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13
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0
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-120
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20
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30
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50
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0
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-12
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15
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12
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9
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9
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15
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0
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-120
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20
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50
|
80
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0
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-15
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19
|
19
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11
|
11
|
20
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0
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-150
|
25
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| 1)0.6 is included. |
| 2)No value for diameter series 7,8. |
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| OUTER RING |
Tolerance in um |
|
D
|
^Dmp
|
VDp2)4)
|
VDmp4)
|
Kea
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^Cs
|
VCs
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Open Bearings
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Capped Bearings2)3)
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mm
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Diameter Series
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9
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0,1
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2,3,4
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2,3,4
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over
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incl.
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high
|
low
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max.
|
max.
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max.
|
high
|
low
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max.
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1)2.5
|
6
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0
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-8
|
10
|
8
|
6
|
10
|
6
|
15
|
Identical to
^Bs and VBs
of inner ring of
same bearing
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|
6
|
18
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0
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-8
|
10
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8
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6
|
10
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6
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15
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18
|
30
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0
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-9
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12
|
9
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7
|
12
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7
|
15
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30
|
50
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0
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-11
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14
|
11
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8
|
16
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8
|
20
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50
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80
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0
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-13
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16
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13
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10
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20
|
10
|
25
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80
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120
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0
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-15
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19
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19
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11
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26
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11
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35
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120
|
150
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0
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-18
|
23
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23
|
14
|
30
|
14
|
40
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| 1)2.5 is included. |
| 3)No values for diameter seriers9,0,1. |
| 2)No values for diameter series 7,8. |
| 4)Fit for before assembling and after disestablish of snap rings. |
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ABEC STANDARD BEARING TOLERANCES FOR INCH-DIMENSION BALL BEARINGS
(See corresponding metric grouping) |
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Inch
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MM
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Over
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Incl.
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Over
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Incl.
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0.0984
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0.2362
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2.5
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6
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0.2362
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0.3937
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6
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10
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0.3937
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0.7087
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10
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18
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0.7087
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1.1811
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18
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30
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1.1811
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1.9685
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30
|
50
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1.9685
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3.1496
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50
|
80
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3.1496
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4.7244
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80
|
120
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| TOLERANCE CLASS ABEC-3 |
| INNER RING |
Tolerance in um. |
|
d
|
^dmp
|
Vdp2)
|
Vdmp
|
Kia
|
^Bs
|
VBs
|
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Diameter Series
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mm
|
9
|
0,1
|
2,3,4
|
|
over
|
incl.
|
high
|
low
|
max
|
max.
|
max.
|
high
|
low
|
max.
|
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1)0.6
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2.5
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0
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-7
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9
|
7
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5
|
5
|
5
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0
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-40
|
12
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2.5
|
10
|
0
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-7
|
9
|
7
|
5
|
5
|
6
|
0
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-120
|
15
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10
|
18
|
0
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-7
|
9
|
7
|
5
|
5
|
7
|
0
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-120
|
20
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18
|
30
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0
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-8
|
10
|
8
|
6
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6
|
8
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0
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-120
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20
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30
|
50
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0
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-10
|
13
|
10
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8
|
8
|
10
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0
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-120
|
20
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50
|
80
|
0
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-12
|
15
|
15
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9
|
9
|
10
|
0
|
-150
|
25
|
| 1)0.6 is included. |
| 2)No values for diameter series 7,8 |
| |
| OUTER RING |
Tolerance in um. |
|
D
|
^Dmp
|
VDp2)4)
|
VDmp4)
|
Kea
|
^Cs
|
VCs
|
|
Open
Bearings
|
Capped Bearings3)
|
|
mm
|
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Diameter Series
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9
|
0,1
|
2,3,4
|
0,1,2,3,4
|
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over
|
incl.
|
high
|
low
|
max
|
max.
|
max.
|
high
|
low
|
max.
|
|
1)2.5
|
6
|
0
|
-7
|
9
|
7
|
5
|
9
|
5
|
8
|
Identical to^Bs and VBsof inner ring ofsame bearing
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6
|
18
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0
|
-7
|
9
|
7
|
5
|
9
|
5
|
8
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18
|
30
|
0
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-8
|
10
|
8
|
6
|
10
|
6
|
9
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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
|
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1) 2.5 is included.
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2) No values for diameter series 7,8
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3) No values for diameter series 9.
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4) Fit for before assembling and after disestablish of snap rings.
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