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Occusam sit renota eumquer • µ a > µ i • Owing to the difference in friction loosening always leads to movement between the two halves of the washer and not between the washer and the mating material or between the washer and the nut screw 3 Difference in friction • If the wedge lock washer expands in thickness due to an unscrewing movement it leads to the elongation of the screw and thus to an increase in preload • This leads to “selflocking” of the screw connection 4 Difference in preload