Stainless steel washers are applied in fastener assemblies to distribute pressure from the head of a bolt across a wider surface area. As a bolt is tightened more pressure is placed against the washer instead of the installation material. Washers can help to prevent pull-through, as well as, damage on soft materials.
Stainless steel washers can also act as a flush surface for a bolt head or nut to tighten against. While not their intended function they can be used as spacers to shorten bolt lengths. They come in many varieties that have different functions, one example is a lock washer. A stainless steel lock washer holds a fastener assembly in place to prevent accidental loosening due to vibrations or other external forces.
Washers made from stainless steel are also corrosion and rust resistant. Each grade has a different environmental range. Due to the metals natural resistance to corrosion and rust, accidental burring of the washer will not compromise its performance.
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