Flange/toothed nut carbon steel stainless steel

A flange nut is a nut with a wide flange on one end that acts as an integral washer. This serves to distribute the pressure of the nut across the part being fastened, thereby reducing the likelihood of damage to the part and making it less likely to loosen due to the uneven tightening surface. These nuts are mostly hexagonal in shape, made of hardened steel, and are usually zinc plated. In many cases, the flange is fixed and rotates with the nut. The flange may be serrated to provide a locking effect. The serrations are angled so that the nut does not rotate in the direction of loosening the nut. Due to the serrations, they cannot be used with washers or on scratched surfaces. The serrations help prevent the vibration of the nut from moving the fastener, thereby maintaining the nut's retention.

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