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