A rotatable connection for a mounting device for arrangement in an operating room, the rotatable connection includes an adjustable stop mechanism, which can be disposed between a first connection component and a second connection component, and is configured to define at least two different relative rotational angles of the connection components relative to each other or at least two different ranges or rotation. The adjustable stop mechanism includes at least one stop device having a respective counterstop, which is axially disposed between a first part and a second part that are each mounted in a torsion-proof manner. The at least one stop device is configured to define the different relative rotational angles or ranges of rotation by way of the respective counterstop. The invention further relates a support system or a mounting device comprising such a rotatable connection, and to a method for setting the adjustable stop mechanism.