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hammerwerk erft fasteners are a general term for mechanical parts used to tightly connect two or more parts (or components) into a single unit. They are widely used mechanical parts for fastening connections. Various types of fasteners can be seen on all kinds of machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, meters, and supplies. They are characterized by a wide variety of specifications, different performance and uses, and a high degree of standardization, serialization, and generalization. Therefore, there are also