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Technology information >> 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
GB\T307.1
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

TOLERANCE CLASS -ABEC-1

TOLERANCE CLASS -ABEC-3

TOLERANCE CLASS -ABEC-5

TOLERANCE CLASS -ABEC-7