A pivot bolt for a pivot joint, the pivot bolt comprising: - a shaft provided with first and second conical end portions (111, 112) and an intermediate cylindrical middle portion being arranged to form a support for a second element, - a first internally conical, radially expandable clamping sleeve arranged axially displaceable on the first conical end portion, and - a second internally conical, radially expandable clamping sleeve arranged axially displaceable on the second conical end portion, wherein the pivot bolt being arranged to be clamped in a first bore of a first element by the axial displacement of the first clamping sleeve on the first conical end portion, the pivot bolt being arranged to be clamped in a second bore of the first element by the axial displacement of the second clamping sleeve on the second conical end portion, wherein the first and the second clamping sleeves are provided with a conical internal surface, a cylindrical external surface, and a salient end portion forming an end face of the first and second clamping sleeves, and with several slits breaking through at least the conical internal surface and the cylindrical external surface, and wherein one of the several slits also cuts through the salient end portion; and wherein clamping of the first and second clamping sleeves is provided by clamping plates being pressed against the end faces of the first and second clamping sleeves by means of clamping screws extending through bolt holes in the clamping plates and into threaded holes in the first and second end portions (111, 112) of the shaft; wherein the shaft is provided with: - a cut-out arranged centrically, and - a groove arranged in the periphery of the middle portion near each of the conical end portions (111, 112), wherein at least a groove side face faces the respective conical end portion (111, 112), and is configured to lie at a distance from the first bore or the second bore, and wherein, the part of the middle portion of the shaft that lies between the grooves is configured not to touch said first and second bores (21, 22) of the first element; and the pivot bolt further comprises at least one measuring element attached on a wall in the cut-out and arranged on a pitch circle that coincides with a middle plane in the respective groove, the at least one measuring element arranged for registering a change in a material tension in the wall, the at least one measuring element is arranged for connection in a signal-communicating manner to a control unit. - a shaft provided with first and second conical end portions (111, 112) and an intermediate cylindrical middle portion being arranged to form a support for a second element, - a first internally conical, radially expandable clamping sleeve arranged axially displaceable on the first conical end portion, and - a second internally conical, radially expandable clamping sleeve arranged axially displaceable on the second conical end portion, wherein the pivot bolt being arranged to be clamped in a first bore of a first element by the axial displacement of the first clamping sleeve on the first conical end portion, the pivot bolt being arranged to be clamped in a second bore of the first element by the axial displacement of the second clamping sleeve on the second conical end portion, wherein the first and the second clamping sleeves are provided with a conical internal surface, a cylindrical external surface, and a salient end portion forming an end face of the first and second clamping sleeves, and with several slits breaking through at least the conical internal surface and the cylindrical external surface, and wherein one of the several slits also cuts through the salient end portion; and wherein clamping of the first and second clamping sleeves is provided by clamping plates being pressed against the end faces of the first and second clamping sleeves by means of clamping screws extending through bolt holes in the clamping plates and into threaded holes in the first and second end portions (111, 112) of the shaft; wherein the shaft is provided with: - a cut-out arranged centrically, and - a groove arranged in the periphery of the middle portion near each of the conical end portions (111, 112), wherein at least a groove side face faces the respective conical end portion (111, 112), and is configured to lie at a distance from the first bore or the second bore, and wherein, - a cut-out arranged centrically, and - a groove arranged in the periphery of the middle portion near each of the conical end portions (111, 112), wherein at least a groove side face faces the respective conical end portion (111, 112), and is configured to lie at a distance from the first bore or the second bore, and wherein, the part of the middle portion of the shaft that lies between the grooves is configured not to touch said first and second bores (21, 22) of the first element; and the pivot bolt further comprises at least one measuring element attached on a wall in the cut-out and arranged on a pitch circle that coincides with a middle plane in the respective groove, the at least one measuring element arranged for registering a change in a material tension in the wall, the at least one measuring element is arranged for connection in a signal-communicating manner to a control unit.