This adapter sleeve is used to mount a bearing with a tapered bore onto a cylindrical shaft, transferring the fit through its tapered outer surface and slotted design, which allows the internal diameter to close slightly during tightening. Bore diameter is 65.0 mm, net mass is 1.143 kg, and the design is standard. The sleeve is fitted together with a locknut and locking device to secure the bearing axially and to set the correct internal clearance during mounting. Since the fit is achieved by driving the bearing along the tapered sleeve surface, the mounted radial clearance can be adjusted precisely, and the assembly can be dismounted without damage to the shaft. No sealing or lubrication is integrated into the sleeve itself, as it functions purely as a mounting accessory for the associated bearing.