a device which non - rotatably connects a hollow shaft with at least one component located on the hollow shaft and positioned with clearance on the hollow shaft so as to be fastened on the hollow shaft in a certain position by eliminating the clearance by expanding the hollow shaft , includes a joining tool that is passable through and expands the hollow shaft for eliminating the clearance , the joining tool has an expansion mandrel defined by at least one first shaping element and at least one further shaping element , the extension mandrel is movable inside the hollow shaft , a guide is provided for guiding the expansion mandrel during its movement inside the hollow shaft , and the shaping elements are movable relative to each other so that a motion of the shaping elements relative to each other causes at least partial expansion of the hollow shaft .