Square washers are washers with a greater resistance to movement than a regular washer once fastened. Due to their larger surface area, more contact can help to hold the washer in place. Commonly used to limit the effect of vibration from loosening a fastener assembly. Square washers are similar to fender washers but have a much larger profile and feature a square shape.
Square washers are shown to function better in earthquakes and are recommended for buildings where seismic activity is likely. Regular washers had a higher pull-though and split rate in this type of application making square washers the optimal choice.
Trade Names: Square Plate Washers
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