External dimensions（mm)
| d | 7 |
| D | 14 |
| B | 3.5 |
| B1 | 5 |
| γ(minimum) | 0.15 |
| γ1(minimum) | 0.15 |
Rated speed min-1
grease
Z·ZZ
V·VV | 52 |
| D·DD | 34000 |
| oilZ | 45000 |
Bearing code
| Open type | 687 |
| dust cover type | 687ZZ1 |
Non contact
sealed | VV |
| Contact sealed | DD |
Installation size(mm)
| da（minimum） | 8.2 |
| db(maximum） | 8.5 |
| da(maximum） | 12.8 |
| Db(minimum) | 12.7 |
| γa（maximum） | 0.15 |
| γb(maximum） | 0.15 |
weight(g)(refer to)
| Open type | 2.13 |
| dust cover type | 2.97 |
describe
687 Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
