Abstract: A coupling (30, 49, 61; 40, 60) with a coupling ring (1) on two coupling parts (8, 9), wherein the coupling parts (8, 9) each constitutes a star (2, 3) with star arms (26, 27) and star arm end regions (4, 5) situated thereon, wherein the two stars (2, 3) are arranged opposite and axialy relative to one another with an angular offset, and the star arm end regions (4, 5) are provided with in each case at least one threaded bore (14) for screw connections (20), wherein the coupling ring (1) includes plurality of fastening elements (10, 11).