Nuts are a common type of fastener, a category of mechanical fastening devices widely used in fields such as mechanical manufacturing. A nut is composed of a hollow cylindrical body and an inner threaded race, which corresponds to the threads of a bolt. It connects to another component through the rotation of the bolt, achieving a fixed effect. Therefore, nuts are part of the fastener category, serving functions of fixation, connection, and support. They are extensively used in various industries including automotive, railway, aviation, shipping, electronics, appliances, construction, and furniture.