Nuts are a common type of fastener, classified as a mechanical connector, widely used in fields such as mechanical manufacturing. A nut is composed of a hollow cylindrical body and an internal threaded collar, which corresponds to the threads on a bolt. The connection to another component is achieved by rotating the bolt, thus providing 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, rail, aviation, shipping, electronics, appliances, construction, and furniture.