External dimensions（mm)
| d | 6.35 |
| D | 15.875 |
| B | 4.978 |
| B1 | 4.978 |
| γ(minimum) | 0.3 |
Rated speed min-1
grease
Open type
Z·ZZ | 38000 |
oil
Open type
Z | 45000 |
Bearing code
| Open type | R4B |
| dust cover type | R4B ZZ |
Installation size(mm)
| da（minimum） | 8.4 |
| db(maximum） | 8.4 |
| Da（maximum） | 13.8 |
| db(maximum） | 13.8 |
| γa（maximum） | 0.3 |
weight(g)(refer to)
| Open type | 4.5 |
| dust cover type | 4.43 |
describe
Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
