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accuracy of bearing
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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|||||
GB\T307.1
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PO
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P6
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P5
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P4
|
P2
|
ISO 492
|
Normal Class
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Class6
|
Class5
|
Class4 |
Class2 |
JIS B 1514
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JIS 0 Grade
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JIS 6 Grade
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JIS 5 Grade
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JIS 4 Grade
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JIS 2 Grade
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AFBMA STD.20
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ABEC 1
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ABEC 3
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ABEC 5
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ABEC7 |
ABEC9 |
TOLERANCE CLASS -ABEC-1
TOLERANCE CLASS -ABEC-3
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