A power-operated chuck (1, 1′) for machine tools a base body (4) attachable to the machine tool,
at least two clamping jaws (6, 7, 8) held in a movable arrangement in the base body (4) and are synchronously controlled and moved radially onto the workpiece (2, 2′) to be clamped by means of one wedge rod (9) each, and with an actuating element (21) held in an axially movable arrangement in the base body (4) and connected in a force-locking arrangement with each of the wedge rods (9) and held coaxially in the base body (4) in relation to its longitudinal axis (5), there being play (23) between the actuating element (21) and the base body (4), the chuck (1, 1′) permitting central positioning of the workpiece (2, 2′) to be clamped in relation to the longitudinal axis (5) of the chuck (1, 1′) and, the chuck permitting the centering adjustment to be undertaken permanently throughout the machining process.