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rpk sdad coop Fasteners are a general term for a class of mechanical parts used to tightly connect two or more parts (or components) into a single unit. They are mechanical parts used for fastening connections and are extremely widely applied. Various types of fasteners can be seen on all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters, and supplies. Their characteristics include a wide variety of types and specifications, different performance and applications, and a high degree of standardization, serialization, and generalization. Therefore, some people refer to