This adapter sleeve provides a mechanical mounting interface between a shaft and a bearing bore, allowing the bearing to be fitted onto a plain cylindrical shaft rather than a tapered one. Bore diameter is 110.0 mm, net mass 3.28 kg, standard design, supplied as a complete unit (FP) for direct assembly without additional machining. The sleeve is tightened axially by a locknut to create a controlled interference fit, which sets the internal radial clearance of the bearing during mounting and allows fine adjustment of that clearance to the required class. This construction is suited for shaft arrangements where the bearing must be positioned at any point along a plain shaft rather than on a stepped or tapered seat, simplifying both mounting and dismounting during service.