This adapter sleeve provides a mechanical connection between a bearing with a tapered bore and a cylindrical shaft, transferring the fit and load through a taper rather than requiring a machined tapered seat on the shaft. It has a bore diameter of 150.0 mm and a net mass of 10.5 kg, built to standard design. The complete set includes the components required for mounting, allowing the bearing to be fitted and locked in position on the shaft using a locknut and lock washer arrangement matched to the sleeve. Because the sleeve allows axial positioning along a plain cylindrical shaft, it simplifies mounting and dismounting of the bearing compared to a directly tapered shaft seat, and it permits fine adjustment of the internal clearance during installation. This makes it suitable for applications where the bearing must be moved along the shaft to a specific position or where a plain shaft is preferred for ease of manufacture and replacement.