Abstract: A pipe coupling has coupling members provided with a pin and a box. The outer surface of the pin is provided with axially extending columns of teeth, separated by free slots, and the inner surface of the box is provided with axially extending columns of counter teeth, also separated by free slots. To connect the coupling, the pin is axially inserted into the box and rotated over a fraction of a full turn to make the engagement surfaces of the teeth engage with the corresponding engagement surfaces of the counter teeth, thereby creating an axial pre-tension between the pin and the box. The design of the teeth is differentiated over the length of the pin and the box to be adapted to differences in loads during make-up and in use and the coupling is protected against release and overturning.