Nuts are a common type of fastener, a type of mechanical fastening device widely used in fields such as mechanical manufacturing. A nut is composed of a hollow cylindrical body and an inner threaded section that corresponds to the screw thread. It connects to another component through the rotation of the screw, 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, marine, electronics, appliances, construction, and furniture.