Where cylindrical roller bearings are subjected to axial loads, total axial run-out (→ Tolerances for bearing seats and abutments) and the size of the abutment surfaces of adjacent components are particularly important for an even load distribution on the flange.
The inner ring flange should only be supported up to half of its height (fig. 1) so that it is not subjected to damaging alternating stresses that can result, for example, from shaft deflection.
The recommended shaft abutment diameter can be obtained using
das = 0,5 (d1 + F)