Weld nut is specially designed for resistance projection welding. It has welding projections on the bottom face, which can be firmly welded onto sheet metal parts. It provides internal thread for bolt connection after welding. Material: carbon steel, stainless steel 304 / 316. Finishes: blue‑white zinc plated, color zinc plated, natural passivation. Widely used in automobile body, sheet metal fabrication, chassis and household appliance manufacturing.