This adapter sleeve provides a mechanical connection between a bearing with a tapered bore and a cylindrical shaft. It has a bore diameter of 50.0 mm and a net mass of 435.0 g, supplied as a standard design, complete unit ready for mounting. The tapered outer surface allows the sleeve to be driven onto the shaft, creating an interference fit that locates and secures the bearing inner ring without requiring a stepped or machined shaft seat. This mounting method simplifies bearing installation and removal on plain shaft sections, and the fit achieved through the sleeve compensates for minor shaft tolerance variations while keeping the bearing properly centered.