Fasteners are mechanical parts widely used for fastening and connecting, and are extensively applied in industries such as energy, electronics, electrical appliances, machinery, chemical engineering, metallurgy, molds, hydraulics, etc. Various fasteners can be seen on various mechanical equipment, vehicles, buildings, structures, instruments and meters, chemical products, etc., and they are widely used basic mechanical components. Their characteristics include a wide variety of types and specifications, different performance and uses, and a high degree of standardization, series, and generalization.