External dimensions（mm)
| d | 8 |
| D | 16 |
| B | 4 |
| B1 | 5 |
| γ(minimum) | 0.2 |
| γ1(minimum) | 0.2 |
Rated speed min-1
grease
Z·ZZ
V·VV | 73 |
| D·DD | 28000 |
| oilZ | 43000 |
Bearing code
| Open type | 688A |
| dust cover type | 688AZZ1 |
Non contact
sealed | VV |
| Contact sealed | DD |
Installation size(mm)
| da（minimum） | 9.6 |
| db(maximum） | 10.2 |
| da(maximum） | 14.4 |
| Db(minimum) | 14.2 |
| γa（maximum） | 0.2 |
| γb(maximum） | 0.2 |
weight(g)(refer to)
| Open type | 3.12 |
| dust cover type | 4.02 |
describe
688A Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
