Spring nuts are usually made of metal, with a threaded nut on the top and one or more coils of spring structure on the bottom. This design provides additional pressure when tightening, increases friction and prevents loosening. According to the shape and installation method, it can be divided into leaf spring nuts and plastic wing nuts. It is widely used in automobiles, construction, mechanical equipment and solar photovoltaic brackets. Common materials include carbon steel, stainless steel, etc. Its surface treatment is generally hot-dip galvanizing. The advantages are good rust resistance, connection stability, and improved structural safety.