Shaft specifications

For bearings mounted on an adapter sleeve, the recommended shaft tolerance class is h9. A cylindricity tolerance of IT5/2 is satisfactory. The same specifications are applicable for the seats of labyrinth seal shaft sleeves.
For bearings mounted on a cylindrical seat on stepped shafts (fig. 1), follow the guidelines in the SKF catalogue Rolling bearings for the bearing seat. The bore of the shaft sleeve of the inboard labyrinth seal is in accordance with the F7 tolerance class and fits bearing seats machined to typical tolerances. The bore of the shaft sleeve of the outboard labyrinth seal is in accordance with the H7 tolerance class and fits shafts machined to the h9 tolerance class.
For bearings mounted on a cylindrical seat on plain shafts, the bore of the shaft sleeves of the labyrinth seals is in accordance with F7 tolerance class and fits bearing seats machined to typical tolerances.
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