Abstract: A device (10) is disclosed for bending hollow structural components (100), in particular pipes, having a mandrel shaft (40) for receiving a receiving element (20), wherein a row of at least two ball joints (30, 30?) connected with each other can be inserted into the receiving element (20) at its end, wherein the row of ball joints (30, 30?) is preferably lockable by a ball-and-socket joint (70) at an end located opposite the receiving element (20), wherein each ball joint (30, 30?) of the row is circumferentially enclosed by a shingle (50, 50?) and the ball-and-socket joint (70) is circumferentially enclosed by an end shingle (60) and the shingles (50, 60) overlap each other at least in portions.