Flange Nuts feature a hexagonal body with an extended base that resembles a built-in washer. This integrated flange helps evenly distribute the load over a larger surface area, reducing the risk of damage to the connected material and helping the nut remain securely fastened. Unlike standard nuts, flange nuts eliminate the need for a separate washer, making them ideal for applications where quick and efficient assembly is required.

The flange base may be smooth or serrated, with the serrated version offering extra grip to prevent loosening due to vibration. These one-directional fasteners are widely used in automotive and industrial assembly lines, where they enhance productivity by combining two functions—nut and washer—into one component.