Turbomachine having a housing (111,112,113), a shaft mounted rotatably relative to the housing about a rotary axis, wherein a radial direction extends perpendicular to the rotary axis, an element with a through-opening, wherein the shaft protrudes through the through-opening and the element is arranged at a predetermined position on the shaft, a first ring element, a second ring element, wherein the first ring element is embodied with a first inner surface in the radial direction and a first outer surface in the radial direction, wherein the second ring element is embodied with a second inner surface in the radial direction, wherein the first ring element is arranged with the first inner surface on the shaft and the element is fixed by means of the first ring element at the predetermined position on the shaft, wherein the second ring element is arranged with the second inner surface lying on the first outer surface of the first ring element and wherein the first outer surface runs conically from a first axial end of the first outer surface to a second axially opposite axial end of the first outer surface and the second inner surface tapers conically in a complementary way to the first outer surface so that, by means of an axial displacement of the second ring element relative to the first ring element, the first ring element is exposed to a radial tension force and hence a compression connection is established between the first ring element and the shaft, a detachable tensioning element for the axial displacement of the second ring element relative to the first ring element, wherein the detachable tensioning element for the axial displacement of the second ring element relative to the first ring element is a screw, which can be screwed between the second ring element and the element in such a way that, by means of the screwing-in of the screw, it is possible to create an axial tension force so that the second ring element is pushed against the first direction onto the first ring element and it is possible to create the radial tension force. a housing (111,112,113), a shaft mounted rotatably relative to the housing about a rotary axis, wherein a radial direction extends perpendicular to the rotary axis, an element with a through-opening, wherein the shaft protrudes through the through-opening and the element is arranged at a predetermined position on the shaft, a first ring element, a second ring element, wherein the first ring element is embodied with a first inner surface in the radial direction and a first outer surface in the radial direction, wherein the second ring element is embodied with a second inner surface in the radial direction, wherein the first ring element is arranged with the first inner surface on the shaft and the element is fixed by means of the first ring element at the predetermined position on the shaft, wherein the second ring element is arranged with the second inner surface lying on the first outer surface of the first ring element and wherein the first outer surface runs conically from a first axial end of the first outer surface to a second axially opposite axial end of the first outer surface and the second inner surface tapers conically in a complementary way to the first outer surface so that, by means of an axial displacement of the second ring element relative to the first ring element, the first ring element is exposed to a radial tension force and hence a compression connection is established between the first ring element and the shaft, a detachable tensioning element for the axial displacement of the second ring element relative to the first ring element, wherein the detachable tensioning element for the axial displacement of the second ring element relative to the first ring element is a screw, which can be screwed between the second ring element and the element in such a way that, by means of the screwing-in of the screw, it is possible to create an axial tension force so that the second ring element is pushed against the first direction onto the first ring element and it is possible to create the radial tension force.