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Functional principles • H > H • The radial teeth on the outside leave an imprint on the mating material • This results in a formfit connection when tightening the screw Wedge lock washers Material 1 Difference in hardness α β • Pitch angle of the wedgeshaped surfaces α > pitch angle of the screw thread β • In the event of selfloosening the wedge effect along with the associated angle difference enables selflocking 2 Difference in angles α > β