External dimensions（mm)
| d | 45 |
| D | 85 |
| T | 28 |
| T3 | 30.1 |
| T4 | 33 |
γ
(minimum) | 1 |
Bearing code
Flat bottomed seat
loop type | 51309 |
Heart regulating ball
Face seat | 53309 |
Spherical seat
loop type | 53309U |
size（mm)
| d1 | 85 |
| d1 | 47 |
| D2 | 65 |
| d3 | 90 |
| B | 10 |
| A | 25 |
| R | 64 |
Installation size(mm)
Da
(minimum） | 69 |
da
(maximum） | 61 |
γa
(maximum) | 1 |
weight(kg)(refer to)
Flat bottomed seat
loop type | 0.672 |
Heart regulating ball
Facial shape | 0.702 |
Spherical seat
loop type | 0.888 |
describe
51309 Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
