External dimensions（mm)
| d | 1 |
| D | 4 |
| B | 1.6 |
| B1 | - |
| γ(minimum) | 0.1 |
| γ1(minimum) | — |
Rated speed min-1
grease
ZZ | 100000 |
oil
Z | 120000 |
Bearing code
| Open type | 691 |
| dust cover type | — |
| sealed | — |
| sealed | — |
Installation size(mm)
| da（minimum） | 1.8 |
| db(maximum） | — |
| da(maximum） | 3.2 |
| Db(minimum) | — |
| γa（maximum） | 0.1 |
| γb(maximum） | — |
weight(g)(refer to)
| Open type | 0.09 |
| dust cover type | — |
describe
Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
