The running accuracy and low operating temperature and thus performance and service life of the bearing application depend on the machining quality of abutment surfaces and bearing seats.
Standard values for form and position tolerances are shown in the following tables.
| Property | Symbol for | Tolerance value | Permissible deviation of form for bearings of tolerance classes | |
| P4 (HG) | P2 (UP) | |||
| Roundness |  | t1 | IT1 | IT0 |
| Conicity (Taper) |  | t1 | IT1 | IT0 |
| Angularity |  | t2 | IT1 | IT0 |
| Axial runout |  | t3 | IT1 | IT0 |
| Concentricit (Misalignment) |  | t4 | IT3 | IT3 |
| Nominal diameter in (mm) | Tolerance quality in micron | |||
| IT0 | IT1 | IT2 | IT3 | |
| > 6 - 10 | 0,6 | 1 | 1,5 | 2,5 |
| > 10 - 18 | 0,8 | 1,2 | 2 | 3 |
| > 18 - 30 | 1 | 1,5 | 2,5 | 4 |
| > 30 - 50 | 1 | 1,5 | 2,5 | 4 |
| > 50 - 80 | 1,2 | 2 | 3 | 5 |
| > 80 - 120 | 1,5 | 2,5 | 4 | 6 |
The quality of the bearing seats and correct fits are of major importance for the functioning of a precise bearing arrangement.
For determining the optimum shaft and housing fits specifically for your application
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