|
The accuracy of YJ deep groove ball bearings is divided into four grades of tolerances with National Standard of P.R. of China : GB/T307. 1-94 which comparisom whih the ISO-standard,ets is im the following table.
| standard |
Tolerance class |
| YJ
(GB/T307.1-94) |
P0 |
P6 |
P5 |
P4 |
| ISO492 |
Normall
class |
class6 |
class5 |
class4 |
| AFBMA
STD.20-1987 |
ABEC-1 |
ABEC-3 |
ABEC-5 |
ABEC-7 |
|
