External dimensions（mm)
| D2 | 30 |
| d | 40 |
| D | 78 |
| t1 | 49 |
| T5 | 54 |
| T7 | 59 |
γ
(minimum) | 1 |
| γ1(minimum) | 0.6 |
Bearing code
Flat bottomed seat
loop type | 52308 |
Heart regulating ball
Facial shape | 54308 |
Spherical seat
loop type | 54308U |
size（mm)
| d3 | 78 |
| d1 | 42 |
| D2 | 60 |
| d3 | 82 |
| T2 | 30.5 |
| T6 | 33 |
| T8 | 35.5 |
| B | 12 |
| B | 8.5 |
| A1 | 23.5 |
| R | 64 |
Installation size(mm)
da
(maximum） | 60 |
γa
(maximum) | 1 |
γb
(maximum) | 0.6 |
weight（kg）
（refer to）
Flat bottomed seat
loop type | 1.04 |
Heart regulating ball
Facial shape | 1.13 |
Spherical seat
loop type | 1.38 |
describe
52308 Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
