Nuts are a common type of fastener, classified as a mechanical connection component, widely used in fields such as mechanical manufacturing. A nut is composed of a hollow cylindrical body and an inner threaded collar, which corresponds to the threads of a screw. By rotating the screw, it connects with another corresponding part to achieve a fixed effect. Therefore, nuts are part of the fastener category, serving as a function of fixation, connection, and support. They are extensively used in various industries including automotive, rail, aviation, shipping, electronics, appliances, construction, and furniture.