A method and a device for tightening threaded joints to a desired pretension level using a manually operated power nutrunner and controlling the tightening process by determining during the tensioning phase the instantaneous growth per time unit of the torque resistance from the joint, and adapting continuously the rotation speed of the nutrunner in relation to the determined instantaneous torque growth per time unit so as to obtain the same reaction force characteristics in the nutrunner handle for all joints, regardless of differences in torque resistance growth per angle of rotation between the joints.