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Washers with a so-called wedge-locking effect are available for the engineering industry. Themanufacturer assures, as confirmed by the Junker vibration test, that the tension in thethread increases when the screw is unscrewed. This is due to the appropriate geometry of thewashers, which always work together in pairs. On the outside, the washers have serrationswhich, when tightening the screw, cut into the material of the clamped part, leaving apermanent plastic deformation. On the inside they have wedges, the angle of which is greaterthan the angle of the helix of the thread. The subject of this work is a study of creating asimulation model that takes into account the discussed effect of wedge lock of the washers.This model will be used in the future for simulation tests of washers with a different geometrythan the one proposed by the manufacturer.