Coupling assembly for fixedly connecting a rotational member to an end section of a hollow shaft, the hollow shaft having a rotational axis, and the end section having an inner shaft diameter (d) and an outer shaft diameter, the coupling assembly comprising: - a shrink ring, - a coupling element, - a plurality of first bolts, and - a plurality of second bolts; wherein the shrink ring comprises: - a shrink ring end surface facing away from the rotational member when the coupling assembly is in use, - a shrink ring outer surface having an outer shrink ring diameter corresponding to the inner shaft diameter (d), - a shrink ring conical surface, and - a plurality of through-going first bores arranged circumferentially and adapted to receive the first bolts, the first bores extending from the shrink ring end surface; and wherein the coupling element comprises: - a first coupling element surface facing away from the rotational member when the coupling assembly is in use, - a second coupling element surface facing towards the rotational member when the coupling assembly is in use, characterized in that, the coupling element further comprises: - an annular groove arranged in the first coupling element surface, the annular groove comprising: ∘ an outer groove surface with a groove diameter corresponding to the outer shaft diameter, ∘ a groove conical surface matching the shrink ring conical surface, and ∘ a bottom surface, - a plurality of through-going second bores arranged circumferentially and extending between the bottom surface of the groove and the second coupling element surface, and - a plurality of first threaded holes extending at positions and orientations matching the plurality of first bores of the shrink ring when the coupling assembly is in use. - a shrink ring, - a coupling element, - a plurality of first bolts, and - a plurality of second bolts; - a shrink ring end surface facing away from the rotational member when the coupling assembly is in use, - a shrink ring outer surface having an outer shrink ring diameter corresponding to the inner shaft diameter (d), - a shrink ring conical surface, and - a plurality of through-going first bores arranged circumferentially and adapted to receive the first bolts, the first bores extending from the shrink ring end surface; - a first coupling element surface facing away from the rotational member when the coupling assembly is in use, - a second coupling element surface facing towards the rotational member when the coupling assembly is in use, characterized in that, the coupling element further comprises: - an annular groove arranged in the first coupling element surface, the annular groove comprising: ∘ an outer groove surface with a groove diameter corresponding to the outer shaft diameter, ∘ a groove conical surface matching the shrink ring conical surface, and ∘ a bottom surface, - a plurality of through-going second bores arranged circumferentially and extending between the bottom surface of the groove and the second coupling element surface, and - a plurality of first threaded holes extending at positions and orientations matching the plurality of first bores of the shrink ring when the coupling assembly is in use. - an annular groove arranged in the first coupling element surface, the annular groove comprising: ∘ an outer groove surface with a groove diameter corresponding to the outer shaft diameter, ∘ a groove conical surface matching the shrink ring conical surface, and ∘ a bottom surface, ∘ an outer groove surface with a groove diameter corresponding to the outer shaft diameter, ∘ a groove conical surface matching the shrink ring conical surface, and ∘ a bottom surface, - a plurality of through-going second bores arranged circumferentially and extending between the bottom surface of the groove and the second coupling element surface, and - a plurality of first threaded holes extending at positions and orientations matching the plurality of first bores of the shrink ring when the coupling assembly is in use.