Abstract: Device for actuating screw bolts, one end of which have spanner flats and the other end of which can be screwed into a receptor screw threading to form screw connections on flanges, lids, closures and the like, the device comprising a support member, the bottom end of which can be placed on a base, said support member having at least one opening for receiving at least one screw bolt end, and a spanner element which is retained by the support member or a part associated therewith and can be rotated by means of a motor drive, and can be brought into torque-transmitting connection with the spanner flats of a screw bolt.