A serrated flange nut, specifically one made from Grade 316 stainless steel, is a type of nut with a flange (a wider, flat area) and serrations (small ridges) on the bearing surface. The flange acts as a built-in washer, distributing pressure and reducing the risk of damage to the fastened material. The serrations provide a locking action, helping to prevent the nut from loosening due to vibration or rotation. Grade 316 stainless steel offers excellent corrosion resistance, making these nuts suitable for marine, automotive, and other applications where exposure to harsh environments is a concern