Abstract: In order in fast clamping of a tool to a machine tool to provide a small amount of play between the tool (2) and the fastening device (1) in a rest position and/or in operation, there is proposed a fastening device having at least one projection of a closure means which can be actuated without the use of a tool and with which the fastening device, wherein in the closed position the projection (410) of the fastening device engages over an associated closure surface (220) of the tool and the tool body is axially secured and held non-rotationally.