This adapter sleeve mounts a bearing with a tapered bore onto a cylindrical shaft seat, transferring the fit through a slotted, tapered surface tightened by a locknut. Bore diameter is 115.0 mm and the net mass is 4.587 kg; the design is standard, without additional flanging or special surface treatment. The tapered outer surface allows the mating bearing to be drawn up axially, generating the correct internal fit and, where required, a controlled internal clearance without needing a stepped or tapered shaft. This simplifies mounting and dismounting on plain cylindrical shafting and supports bearing arrangements where axial positioning is achieved through the sleeve and locknut rather than shaft shoulders.