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achill is the general term for a class of mechanical parts used to fasten two or more parts (or components) into a single unit through a secure connection. It is a type of mechanical part widely used for fastening connections. Fasteners can be seen in various forms on machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters, and supplies. They are characterized by a wide variety of specifications, diverse performance and applications, and a high degree of standardization, serialization, and generalization. Therefore, some people refer to those that already have national standards as