Serrated lock washers increase the friction between the bolt head/nut and the mating surface. They do this by gripping into the mating surfaces. Serrated lock washers are installed between the bolt head/nut and the mating surface. The bolted joint is then tightened in the same way as an unsecured bolt. If the bolted joint experiences a loss of tension, the washer is no longer effective and must be replaced.
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Single part serrated washers can damage painted/coated surfaces because they have a tendency to rotate with the fastener. This risks damaging the surface, cracking the paint/coating and causing corrosion.
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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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