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accuracy of bearing

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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 -ABEC7

 

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