Weld nuts are fastening components engineered to be permanently attached to another metal surface by welding. Unlike standard nuts that rely on clamping force alone, weld nuts feature small protrusions, flanges, or projections that melt during the welding process, securing the nut in place and creating a solid, permanent threaded insert. They are commonly manufactured in square, round, or hexagonal forms and can include pilot extensions or locating bosses to ensure accurate placement during assembly. Due to their strength and reliability, weld nuts are widely used in the automotive industry, heavy equipment manufacturing, and structural frameworks where vibration resistance and permanent threaded connections are essential.