External dimensions（mm)
| d | 3.175 |
| D | 6.35 |
| B | 2.38 |
| B1 | 2.779 |
| γ(minimum) | 0.1 |
Rated speed min-1
grease
Open type
Z·ZZ | 67000 |
oil
Open type
Z | 80000 |
Bearing code
| Open type | R144 |
| dust cover type | R144 ZZ |
Installation size(mm)
| da（minimum） | 4 |
| db(maximum） | 3.9 |
| Da（maximum） | 5.5 |
| db(maximum） | 5.9 |
| γa（maximum） | 0.1 |
weight(g)(refer to)
| Open type | 0.25 |
| dust cover type | 0.27 |
describe
Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
