A tool (1) for breaking a shaft comprises a first (3) and a second (4) tubular element, both provided with inner through bores (41, 42) adapted to receive a first and second portion of said shaft in a parking position of the tool (1). A first handle (5) is fixedly connected with the first tubular element (3), wherein the second tubular element (4) is connected to a second handle (6). A bottom surface (33) of the second tubular element (4) is in contact with a neck surface of the first tubular element (3) forming a shearing plane (I) perpendicular to the main axis (T) of the tool. Starting from said parking position, a rotation between the two tubular elements (3 and 4) around this axis (T) creates a twisting movement of the two shaft portions received in the two tubular elements (3, 4), respectively, and shears the shaft portions at the interface (33) between them. The second handle is a turning handle (6) mounted on the first tubular element (3) for a rotation around an axis (R.) and comprising a gear (10, 44) engaging the second tubular element (4) for transmittal of a rotation of the turning handle (7) into a rotation of the second tubular element (4, 10) for said twisting movement.
