External dimensions（mm)
| d | 90 |
| D | 135 |
| T | 35 |
| T3 | 38.5 |
| T4 | 42 |
γ
(minimum) | 1.1 |
Bearing code
Flat bottomed seat
loop type | 51218 |
Heart regulating ball
Face seat | 53218 |
Spherical seat
loop type | 53218U |
size（mm)
| d1 | 135 |
| d1 | 93 |
| D2 | 110 |
| d3 | 140 |
| B | 13.5 |
| A | 45 |
| R | 100 |
Installation size(mm)
Da
(minimum） | 117 |
da
(maximum） | 108 |
γa
(maximum) | 1 |
weight(kg)(refer to)
Flat bottomed seat
loop type | 1.69 |
Heart regulating ball
Facial shape | 1.89 |
Spherical seat
loop type | 2.38 |
describe
51218 Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
