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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
GBT307.1POP6P5P4P2
ISO 492Normal ClassClass6Class5Class4Class2
JIS B 1514JIS 0 GradeJIS 6 GradeJIS 5 GradeJIS 4 GradeJIS 2 Grade
AFBMA STD.20ABEC 1ABEC 3ABEC 5ABEC7ABEC9
2017-06-15 10:17:05


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