The Flange Nut threads onto the clamping stud above your clamp, locking the entire hold-down assembly in place. The integrated flange — a wide, flat bearing face below the hex — distributes clamping force across a larger area than a standard nut, which reduces point loading on the clamp surface.

This matters on hardened clamps and step blocks: concentrated load from a plain nut can dish the contact face over time, causing uneven clamping pressure. The flange spreads that force and keeps the assembly flat.