A ceiling pivot arm to hold equipment that can be rotated, especially medical equipment which is held on a mount through a pivot bearing. Simple assembly of the rotary hinge is possible, whereby it is also easy to make and disassemble the connection between the mount and the pivot arm, so that high functional reliability is produced for operation. To do this, it is provided that the pivot bearing consists of a threaded ring (1) constituting the mount, in whose threads (3, 4) is engaged a threaded collar (2) movable relative to the mount and connected to the pivot arm.