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PT ES AR RU FR DE IT PTThere 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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