Factors for calculating the preload of a bearing set
| Number of bearings | Arrangement | Designation suffix | Factor | |
| for preload class | ||||
| A, B, C and D | L, M and F | |||
| 3 | Back-to-back and tandem | TBT | 1,35 | 1 |
| Face-to-face and tandem | TFT | 1,35 | 1 | |
| 4 | Back-to-back and tandem | QBT | 1,6 | 1 |
| Face-to-face and tandem | QFT | 1,6 | 1 | |
| Tandem back-to-back | QBC | 2 | 2 | |
| Tandem face-to-face | QFC | 2 | 2 | |
| 5 | Back-to-back and tandem | PBT | 1,75 | 1 |
| Face-to-face and tandem | PFT | 1,75 | 1 | |
| Tandem back-to-back | PBC | 2,45 | 2 | |
| Tandem face-to-face | PFC | 2,45 | 2 | |
