To facilitate automated production of steering shafts, two Zwick testing machines have been integrated into a production line. One testing machine is used to determine the maximum torsion angle in the middle of the production sequence, allowing process-oriented analysis of the previous assembly steps. A special angled sensor was developed for the high precision requirements in connection with relative torsion angle measurement. The second testing machine is located at the end of the production line; its function is to determine the steering shaft displacement load.