External dimensions（mm)
| d | 100 |
| D | 150 |
| T | 38 |
| T3 | 40.9 |
| T4 | 45 |
γ
(minimum) | 1.1 |
Bearing code
Flat bottomed seat
loop type | 51220 |
Heart regulating ball
Face seat | 53220 |
Spherical seat
loop type | 53220U |
size（mm)
| d1 | 150 |
| d1 | 103 |
| D2 | 125 |
| d3 | 155 |
| B | 14 |
| A | 52 |
| R | 112 |
Installation size(mm)
Da
(minimum） | 130 |
da
(maximum） | 120 |
γa
(maximum) | 1 |
weight(kg)(refer to)
Flat bottomed seat
loop type | 2.25 |
Heart regulating ball
Facial shape | 2.49 |
Spherical seat
loop type | 3.03 |
describe
51220 Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
