A blade wheel for a rotor of a turbomachine, comprising a wheel disc, which is to be provided on a rotor shaft of the rotor and which has a plurality of grooves, which are arranged distributed along an outer circumference of the wheel disc and which extend in each case in a thickness direction of the wheel disc running axially to the rotor shaft, wherein on two groove sides of each groove running parallel to the thickness direction located opposite one another a tooth profile is formed in each case, a plurality of moving blades, of which each comprises a blade root with two blade root sides facing away from one another running parallel to the thickness direction, on which in each case a tooth profile is formed, wherein each moving blade forming a moving blade-groove combination is inserted with its blade root into one of the respective grooves so that the tooth profiles of the blade root sides are in engagement with the tooth profiles of the groove sides, and wherein each moving blade-groove combination comprises a fixing device which is equipped to fix the moving blade in the groove both in thickness direction and in a radial direction of the wheel disc against movement, wherein each fixing device comprises a recess that is closed on both sides at least in thickness direction in an underside of the moving blade facing a bottom of the groove and a bolt, which is moveably received in the bottom of the groove so that the bolt is adjustable in the radial direction in a controlled manner between an unlocking position in which the bolt does not engage in the recess of the moving blade, and a locking position, in which the bolt radially engages in the recess of the moving blade so that it pushes the moving blade radially to the outside with a predetermined force, wherein each fixing device in the wheel disc comprises a first passage running in the radial direction which, at a first longitudinal end of the same, opens into the groove and in which the bolt is fitted, wherein each fixing device comprises an actuating device, which is arranged at a second longitudinal end of the first passage for the controlled adjusting of the bolt, and wherein the actuating device is equipped so that it is activatable for adjusting the bolt from a side of the wheel disc facing in the thickness direction, wherein the actuating device comprises a second passage, which is formed running in the thickness direction of the wheel disc and formed with internal thread in the same, so that the first passage with its second longitudinal end opens into the second passage and a first longitudinal end of the second passage opens into the lateral side of the wheel disc and a screw element, which is screwed into the second passage from the lateral side of the wheel disc and which is operatively connected with a radially innermost end of the bolt so that a shifting of the screw element in thickness direction of the wheel disc brings about a shifting of the bolt in radial direction, characterized in that a longitudinal end of the screw element provided for the contact with the bolt is formed with a first cone shape and wherein the radially innermost end of the bolt is formed with a second cone shape so that between respective lateral surfaces of the first and the second cone shape a line contact is realised.