Membership
Technology-bearing Accuracy Class
2019-06-26The boundary dimensions tolerance and rotational accuracy of deep groove ball bearing are classed as five grades subject to National standard of GB/T1307.1, they can match and interconvert with standard of ISO492, JISB1514 and ANSI/AFBMSTD20.
Their conventional comparison is shown in the following table.
(standard No.) | (Tolerance grades) | ||||
GB/T307.1 | 0 | 6 | 5 | 4 | 2 |
JIS B1514 | Class0 | Class6 | Class5 | Class4 | Class2 |
ISO492 | Normal | Class6 | Class5 | Class4 | Class2 |
DIN 620 | P0 | P6 | P5 | P4 | P2 |
AISI/AFBMA STD20 | ABEC-l | ABEC-3 | ABEC-5 | ABEC-7 | ABEC-9 |
