Abstract: A spindle headstock of a multiple-operation machine tool, whose housing accommodates, in a coaxial and rotatable arrangement, a spindle kinematically coupled to a rotary drive, a tie rod carrying members intended for connection to the shank of a boring head having a swivel carriage, which tie rod is axially adjustable in relation to the spindle, and a bar carrying toothed members for meshing with toothed members mounted on an end of a slide bar whose opposite end serves for radial displacement of the carriage. The bar is kinematically coupled to a drive whereby it is displaced in the axial direction in relation to the spindle. The members of the tie rod, which serve for connection to the shank of the boring head, are mounted on the tie rod so that they can radially reciprocate during location of the tie rod. For radial adjustment of the bar, a bushing is provided on the tie rod, which is axially stationary in relation to the tie rod and kinematically coupled to the spindle and bar.