A rotor of an impact crusher has at least one stellate plate, which can be attached to the rotor shaft. A plurality of paddle-blade type hammer tools are mounted on each stellate plate. The hammer tools are secured above and below the stellate plate by tool mounting brackets having hook-shaped ends that engage with the hammer tools. A respective adapter piece is placed in the stellate plate between the two tool mounting brackets. A retaining bolt penetrates the two tool mounting brackets and the adapter piece. A security slide secures the retaining bolt in position. The hammer tools of the inventive rotor for an impact crusher have a high usage volume and the rotor is extremely user-friendly with respect to the recurring tasks of setting and replacing the hammer tools, without having to loosen screw connections.