Swivel joint system, particularly for swivelling attachment of an exterior mirror to a vehicle, with: a first articulated arm which has a first and a second bearing shell (120, 130) and at least one locking shell, a second articulated arm with an end section that has a bush bearing, wherein the bush bearing is positioned between the first and second bearing shell (120, 130) and has a first counter bearing shell interacting with the first bearing shell and a second counter bearing shell interacting with the second bearing shell, wherein the second articulated arm is biased against the first articulated arm in the axial direction by means of a spring element and can be swivelled about a joint axle; and a locking pin with a pin head arranged on a proximal end section and a distal end section for the swivel connection of the two articulated arms (100, 200), wherein the locking pin penetrates the first bearing shell, the bush bearing and the second bearing shell with a pin shaft and is fixed axially in the at least one locking shell, and a centring element that has an opening penetrable by the pin shaft and an application surface that surrounds the opening to support an end of the spring element; and characterized in that the centring element is pushed in the direction towards the proximal end section of the locking pin due to the spring element, and that it further comprises: a peripheral outer surface that can be radially spread out under axial application of force through the spring element or that has the elastic properties required for spreading out, so that the centring element and thus the locking pin is centred and radially positioned in regard to the second bearing shell or the second counter bearing shell. a first articulated arm which has a first and a second bearing shell (120, 130) and at least one locking shell, a second articulated arm with an end section that has a bush bearing, wherein the bush bearing is positioned between the first and second bearing shell (120, 130) and has a first counter bearing shell interacting with the first bearing shell and a second counter bearing shell interacting with the second bearing shell, wherein the second articulated arm is biased against the first articulated arm in the axial direction by means of a spring element and can be swivelled about a joint axle; and a locking pin with a pin head arranged on a proximal end section and a distal end section for the swivel connection of the two articulated arms (100, 200), wherein the locking pin penetrates the first bearing shell, the bush bearing and the second bearing shell with a pin shaft and is fixed axially in the at least one locking shell, and a centring element that has an opening penetrable by the pin shaft and an application surface that surrounds the opening to support an end of the spring element; and characterized in that the centring element is pushed in the direction towards the proximal end section of the locking pin due to the spring element, and that it further comprises: a peripheral outer surface that can be radially spread out under axial application of force through the spring element or that has the elastic properties required for spreading out, so that the centring element and thus the locking pin is centred and radially positioned in regard to the second bearing shell or the second counter bearing shell. a peripheral outer surface that can be radially spread out under axial application of force through the spring element or that has the elastic properties required for spreading out, so that the centring element and thus the locking pin is centred and radially positioned in regard to the second bearing shell or the second counter bearing shell.