External dimensions（mm)
| d | 40 |
| D | 78 |
| T | 26 |
| T3 | 28.5 |
| T4 | 31 |
γ
(minimum) | 1 |
Bearing code
Flat bottomed seat
loop type | 51308 |
Heart regulating ball
Face seat | 53308 |
Spherical seat
loop type | 53308U |
size（mm)
| d1 | 78 |
| d1 | 42 |
| D2 | 60 |
| d3 | 82 |
| B | 8.5 |
| A | 28 |
| R | 64 |
Installation size(mm)
Da
(minimum） | 63 |
da
(maximum） | 55 |
γa
(maximum) | 1 |
weight(kg)(refer to)
Flat bottomed seat
loop type | 0.536 |
Heart regulating ball
Facial shape | 0.581 |
Spherical seat
loop type | 0.704 |
describe
51308 Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
