Serrated lock washers increase the friction between the bolt head/nut and the mating surface. They do this by gripping into the mating surfaces.They function much in the same way a serrated flange nut works, but as these are conical, they are pressed down into the surface as the fastener is tightened. Make sure the serrations face the correct direction if the washer isn't serrated on both sides!. They are available in metric and standard in a wide variety of metals.

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