Under normal operating conditions the shaft seats for Y-bearings with grub screw locking or with eccentric locking collar should be machined to tolerance h7.
For light loads and low speeds tolerance h8 can be used and for very simple applications tolerances h9 to h11 will suffice.
The shaft seats for bearings with adapter sleeve should be machined to tolerance h9/IT5.
For the bearings with standard inner ring the same recommendations apply as for standard deep groove ball bearings, e.g. tolerance j6 for light loads (P ≤ 0,05 C).