The bearings tolerance or dimension accuracy are regulated by "ISO492" standard with:0 Grade;6 Grade 5 Grade;4 Grade;2 Grade.Class 0 corresponds to normal precision class bearings, and precision becomes progressively higher as the class number becomes smaller; i.e., Class 6 is less precise than Class 5, which is less precise than Class 4, and so on.
The Interchange Table Of Bearings Tolerance Of National Standards
| Standard | Tolerance Class | ||||||||
|
Standardization Administration of the People's Republic of China(SAC) |
GB | 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | |||
|
International Organization for Standardization (ISO) |
ISO492 | Class 6X | Class6 | Class5 | Class4 | Class2 | |||
|
Deutsches Institut fur Normung(DIN) |
DIN620 | P0 | P6 | P5 | P4 | P2 | |||
|
American National Standards Institute (ANSI) |
ANSI/ABMA Std.20 | ABEC1 | ABEC3 | ABEC5 | ABEC7 | ABEC9 | |||
|
Japanese industrial standard (JIS) |
JIS B 1514 | class 0,6X | class 6 | class 5 | class 4 | class 2 | |||
Tolerance For Radial Bearings Except Tapered Roller Bearings
Inner Ring
unit:um
Nominal Bore
Diameter
Single Plane Mean Bore Diameter Deviation
∆dmp
d(mm)
0 Grade
6 Grade
5 Grade
4 Grade
2 Grade
over
incl
High
Low
High
Low
High
Low
High
Low
High
Low
0.6
2.5
0
-8
0
-7
0
-5
0
-4
0
-2.5
2.5
10
0
-8
0
-7
0
-5
0
-4
0
-2.5
10
18
0
-8
0
-7
0
-5
0
-4
0
-2.5
18
30
0
-10
0
-8
0
-6
0
-5
0
-2.5
30
50
0
-12
0
-10
0
-8
0
-6
0
-2.5
50
80
0
-15
0
-12
0
-9
0
-7
0
-4
| Single Radial Plane Bore Diameter Variation | |||||||||
| ∆dp | |||||||||
| Diameter Series 9 | Maxdiameter Series 0.1 | ||||||||
| 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade |
| 10 | 9 | 5 | 4 | 2.5 | 8 | 7 | 4 | 3 | 2.5 |
| 10 | 9 | 5 | 4 | 2.5 | 8 | 7 | 4 | 3 | 2.5 |
| 10 | 9 | 5 | 4 | 2.5 | 8 | 7 | 4 | 3 | 2.5 |
| 13 | 10 | 6 | 5 | 2.5 | 10 | 8 | 5 | 4 | 2.5 |
| 15 | 13 | 8 | 6 | 2.5 | 12 | 10 | 6 | 5 | 2.5 |
| 19 | 15 | 9 | 7 | 4 | 19 | 15 | 7 | 5 |
4 |
| Single Radial Plane Bore Diameter Variation | Mean Single Plan Bore Diameter Variation | ||||||||
| Vdp | Vdmp | ||||||||
| Maxdiameter Series 2.3.4 | 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | ||||
| 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | Max | ||||
| 6 | 5 | 4 | 3 | 2.5 | 6 | 5 | 3 | 2 | 1.5 |
| 6 | 5 | 4 | 3 | 2.5 | 6 | 5 | 3 | 2 | 1.5 |
| 6 | 5 | 4 | 3 | 2.5 | 6 | 5 | 3 | 2 | 1.5 |
| 8 | 6 | 5 | 4 | 2.5 | 8 | 6 | 3 | 2.5 | 1.5 |
| 9 | 8 | 6 | 5 | 2.5 | 9 | 8 | 4 | 3 | 1.5 |
| 11 | 9 | 7 | 5 | 4 | 11 | 9 | 5 | 3.5 | 2 |
| Inner Ring Radial Runout | Inner Ring Width Deviation | |||||||||
| Kia | ∆Bs | |||||||||
| 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | 0;6 Grade | 5;4 Grade | 2 Grade | |||
| Max | High | Low | High | Low | High | Low | ||||
| 10 | 5 | 4 | 2.5 | 1.5 | 0 | -40 | 0 | -40 | 0 | -40 |
| 10 | 6 | 4 | 2.5 | 1.5 | 0 | -120 | 0 | -40 | 0 | -40 |
| 10 | 7 | 4 | 2.5 | 1.5 | 0 | -120 | 0 | -80 | 0 | -80 |
| 13 | 8 | 4 | 3 | 2.5 | 0 | -120 | 0 | -120 | 0 | -120 |
| 15 | 10 | 5 | 4 | 2.5 | 0 | -120 | 0 | -120 | 0 | -120 |
| 20 | 10 | 5 | 4 | 2.5 | 0 | -150 | 0 | -150 | 0 | -150 |
Tolerance For Radial Bearings Except Tapered Roller Bearings
Outer Ring
unit:um
Nominal Outer
Diameter
Single Plane Mean Outer Diameter Deviation
∆Dmp
D(mm)
0 Grade
6 Grade
5 Grade
4 Grade
2 Grade
over
incl
High
Low
High
Low
High
Low
High
Low
High
Low
0.6
2.5
0
-8
0
-7
0
-5
0
-4
0
-2.5
2.5
10
0
-8
0
-7
0
-5
0
-4
0
-2.5
10
18
0
-9
0
-8
0
-6
0
-5
0
-4
18
30
0
-11
0
-9
0
-7
0
-6
0
-4
30
50
0
-13
0
-11
0
-9
0
-7
0
-4
50
80
0
-15
0
-13
0
-10
0
-8
0
-5
| Single Radial Plane Outer Diameter Variation | |||||||||
| VDp | |||||||||
| Diameter Series 9 | Maxdiameter Series 0.1 | ||||||||
| 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade |
| 10 | 9 | 5 | 4 | 2.5 | 8 | 7 | 4 | 3 | 2.5 |
| 10 | 9 | 5 | 4 | 2.5 | 8 | 7 | 4 | 3 | 2.5 |
| 12 | 10 | 6 | 5 | 4 | 9 | 8 | 5 | 4 | 4 |
| 14 | 11 | 7 | 6 | 4 | 11 | 9 | 5 | 5 | 4 |
| 16 | 14 | 9 | 7 | 4 | 13 | 11 | 7 | 5 | 4 |
| 19 | 16 | 10 | 8 | 5 | 19 | 16 | 8 | 6 | 5 |
| Single Radial Plane Outer Diameter Variation | Mean Single Plan Outer Diameter Variation | ||||||||
| VDp | VDmp | ||||||||
| Maxdiameter Series 2.3.4 | 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | ||||
| 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | Max | ||||
| 6 | 5 | 4 | 3 | 2.5 | 6 | 5 | 3 | 2 | 1.5 |
| 6 | 5 | 4 | 3 | 2.5 | 6 | 5 | 3 | 2 | 1.5 |
| 7 | 6 | 5 | 4 | 4 | 7 | 6 | 3 | 2.5 | 2 |
| 8 | 7 | 5 | 5 | 4 | 8 | 7 | 4 | 3 | 2 |
| 10 | 8 | 7 | 5 | 4 | 10 | 8 | 5 | 3.5 | 2 |
| 11 | 10 | 8 | 6 | 5 | 11 | 10 | 5 | 4 | 2.5 |
| Outer Ring Radial Runout | Outer Ring Width Deviation | |||||||||
| Kea | ∆Cs | |||||||||
| 0 Grade | 6 Grade | 5 Grade | 4 Grade | 2 Grade | 0;6 Grade | 5;4 Grade | 2 Grade | |||
| Max | High | Low | High | Low | High | Low | ||||
| 15 | 8 | 5 | 3 | 1.5 | 0 | -40 | 0 | -40 | 0 | -40 |
| 15 | 8 | 5 | 3 | 1.5 | 0 | -120 | 0 | -40 | 0 | -40 |
| 15 | 9 | 6 | 4 | 2.5 | 0 | -120 | 0 | -80 | 0 | -80 |
| 20 | 10 | 7 | 5 | 2.5 | 0 | -120 | 0 | -120 | 0 | -120 |
| 25 | 13 | 8 | 5 | 4 | 0 | -120 | 0 | -120 | 0 | -120 |
| 35 | 18 | 10 | 6 | 5 | 0 | -150 | 0 | -150 | 0 | -150 |
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