This adapter sleeve provides a mounting interface for bearings with a tapered bore, allowing the bearing to be fitted onto a cylindrical shaft seat. The sleeve carries a bore diameter of 45.0 mm and a net mass of 0.276 kg, built to standard design. Being a mechanical, complete accessory component, it is assembled with a locknut and lockwasher to draw the bearing onto the sleeve, creating the required interference fit. The tapered outer surface of the sleeve compensates for the difference between the shaft diameter and the bearing bore, enabling precise radial positioning without machining a taper directly into the shaft. This construction simplifies mounting and dismounting of the bearing, particularly on plain cylindrical shaft sections, and allows for adjustment of internal clearance during installation through controlled axial displacement of the bearing along the sleeve.