Nuts are a common type of fastener, classified as a mechanical connector, widely used in fields such as mechanical manufacturing. Nuts are composed of a hollow cylinder and an internal threaded collar that corresponds to the screw threads. They connect to another component through the rotation of a screw, achieving a fixed effect. Therefore, nuts are part of the fastener category, serving as a means of fixation, connection, and support. They are extensively used in various industries including automotive, rail, aviation, shipping, electronics, appliances, construction, and furniture.