This adapter sleeve provides a mechanical fit between a bearing with a tapered bore and a plain cylindrical shaft, transmitting load through friction generated by controlled radial interference upon tightening. The bore diameter of the shaft seating is 55.0 mm, and the sleeve has a net mass of 0.333 kg. The design is of standard configuration, supplied as a complete unit ready for mounting. The sleeve allows precise axial positioning of the bearing on a smooth shaft without requiring a stepped or threaded seat, simplifying mounting and dismounting compared to a directly tapered shaft. Because the fit is achieved through interference rather than a keyed connection, the sleeve compensates for minor shaft diameter tolerances and allows the bearing to be repositioned along the shaft during assembly before final tightening. It is intended to be used together with a matching tapered-bore bearing and, where required, a lock nut and washer to secure the assembly axially.