BEARING TOLERANCE

Comparison of tolerance classifications of national standards

National standard

Tolerance class

China National standard

GB/T 307.1

Class 0

Class 6

Class 5

Class 4

Class 2

International organization for standardization

ISO 492

Normal class

Class 6

Class 6X

Class 5

Class 4

Class 2

Deutsches institute for              normung

DIN 620

Normal class

Class 6

Class 6X

Class 5

Class 4

Class 2

Japanese industrial standed

JIS B1514

Normal class

Class 6

Class 6X

Class 5

Class 4

Class 2

American national standard  institus anti-friction bearing manufactures

ANSI                              

Tapered roller

Class 4

Class 2

Class 3

Class 0

Class 00

Bearings

Inch size

AFBMA                             

Ball bearings

ABEC 1

ABEC 3

ABEC 5

ABCE 7

ABCE 9

ABEC 5P

ABCE 7P

ABCE 9P

Roller bearings

RBEC 1

RBEC 3

RBEC 5

RBEC 7

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Tolerance Symbols