This adapter sleeve provides a mechanical interface for mounting a bearing with a tapered bore onto a cylindrical shaft. It has a bore diameter of 80.0 mm and a net mass of 1.41 kg, in standard design, supplied as a complete accessory unit. The sleeve is fitted between the shaft and the bearing bore, allowing the bearing to be positioned at any point along the shaft length and secured by tightening the locknut, which draws the sleeve into the tapered bore and creates an interference fit. This design simplifies mounting and dismounting compared to bearings fitted directly onto tapered shaft seats, and it accommodates minor shaft diameter tolerances without requiring ground shaft shoulders.