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Accuracy

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
GBT307.1 PO P6 P5 P4 P2
ISO 492 Normal Class Class6 Class5 Class4 Class2
JIS B 1514 JIS 0 Grade JIS 6 Grade JIS 5 Grade JIS 4 Grade JIS 2 Grade
AFBMA STD.20 ABEC 1 ABEC 3 ABEC 5 ABEC7 ABEC9

 

 

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