Nuts are a common type of fastener, classified as a mechanical fastening device, widely used in fields such as mechanical manufacturing. A nut is formed by a hollow cylindrical body and an internal threaded collar that corresponds to the screw thread. It connects to another corresponding part 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, shipping, electronics, appliances, construction, and furniture.