External dimensions（mm)
| d | 45 |
| D | 100 |
| B | 36 |
| γ(minimum) | 1.5 |
| γ1(minimum) | 1.5 |
| FW | 58.5 |
| EW | — |
Bearing code
| | * NU 2309 ET U537 |
| NU type | NU |
| NJ type | NJ |
| NUP type | NUP |
| N type | — |
| NF type | — |
Installation size(mm)
| da（minimum） | 53 |
| Db(minimum) | 53 |
| db(maximum） | 56 |
| dc(minimum） | 60 |
| dd(minimum） | 66 |
| da(maximum） | 92 |
| db(maximum） | — |
| Db(minimum) | — |
| γa（maximum） | 1.5 |
| γb(maximum） | 1.5 |
describe
* NU 2309 ET U537 Bearings are mainly used in industries such as construction machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, and railways
