Nuts are a common type of fastener, classified as a mechanical fastening device, widely used in fields such as mechanical manufacturing. Nuts are composed of a hollow cylindrical body and an inner threaded collar that corresponds to the screw thread. They connect to another component through the rotation of a 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.