This adapter sleeve is a mounting accessory used to fit bearings with a tapered bore onto cylindrical shafts, creating a mechanical interference connection between the shaft and the bearing bore. The bore diameter is 55.0 mm and the net mass is 0.52 kg, with a standard design. The sleeve is a complete, mechanical component supplied ready for fitting. Using an adapter sleeve of this design allows the bearing to be positioned freely along the shaft length rather than at a fixed shoulder, simplifying axial adjustment during assembly. Since the connection is achieved through controlled interference on the tapered seat, the mounting method also permits removal without damaging the shaft or the bearing bore, provided the correct tightening procedure is followed. This design H sleeve is intended to be paired with a bearing sharing the same bore diameter of 55.0 mm.