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Flange nuts are hex-shaped nuts with a flange that works as an integrated washer. The flange distributes the load pressure over a larger area to prevent damage in the materials. Moreso, they may have serrated flanges that provide a better grip to lock itself in place. Some common applications of flange nuts include automotive assembly, manufacturing, and other metal assemblies. Flange nuts are usually made from stainless steel and are available in different sizes.