A DIN 928 welded square nut has three weld projections and an internal machine screw thread. It is available in stainless steel and plain finish steel, with a 6G thread tolerance. This nut is used in machine screws, and is available in right-hand or left-hand threads.
Square weld nuts are manufactured by resistance welding, which combines pressure and current to bond metal pieces together. They can be made from stainless steel, and can be welded to a variety of objects. They are available in thread sizes, and are compatible with a wide variety of panel materials.jinduhardware.com