This adapter sleeve provides a mounting interface between a cylindrical shaft and a bearing bore with a tapered seat, allowing the bearing to be fitted at any position along the shaft without a shoulder. The bore diameter is 320.0 mm, outside diameter 380.0 mm, and net mass 32.2 kg. Design HG indicates hydraulic mounting, where pressurized oil is used to expand the sleeve during fitting and removal, reducing the axial force needed and minimizing the risk of damage to the mating surfaces during assembly. Hydraulic mounting with an HG sleeve gives a controlled, repeatable fit and simplifies dismounting, since oil pressure separates the sleeve from the shaft without hammering or excessive force. This makes the sleeve suitable for larger bearing bores where manual mounting would require impractical force, and where accurate axial positioning and even fit around the shaft circumference are needed. The sleeve is supplied complete, ready for use with FP-type hydraulic fitting equipment.