Nuts are a common type of fastener, a category of mechanical fastening devices widely used in mechanical manufacturing and other fields. A nut is composed of a hollow cylindrical body and an inner threaded collar that corresponds to the threads of a screw. It connects to another component by rotating the screw, achieving a fixed effect. Therefore, nuts are part of the fastener family, serving as a means of fastening, connecting, and supporting. They are extensively used in various industries such as automotive, rail, aviation, shipping, electronics, appliances, construction, and furniture.