ASME B18.2.2 is the primary North American standard for Inch Series Hexagon Nuts, including the specific dimensional requirements for Hexagon Flange Nuts. This integrated design incorporates a wide circular base (flange) that acts as a unified washer, distributing the clamping load across a larger surface area to prevent indentation and maintain joint integrity.

These flange nuts are essential in high-stress applications such as frame assembly, piping systems, and automotive manufacturing. By combining the nut and washer into a single component, ASME B18.2.2 compliant fasteners streamline procurement, reduce assembly errors, and optimize torque retention in vibration-prone environments.

The technical focus of ASME B18.2.2 Flange Nuts is the bearing area ratio. The standard specifies rigorous tolerances for the flange diameter and thickness to ensure that the contact stress remains below the yield strength of the base material. The design often includes a slight "crown" on the flange to ensure initial contact occurs at the outer diameter, maximizing the locking friction and torque efficiency.