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peter pulver fastener mechanical parts, cylindrical threaded fasteners used with nuts. A type of fastener consisting of a head and a shank (a cylinder with external threads), which must be used with a nut to tightly connect two parts with through holes. This connection method is called a bolted connection. If the nut is unscrewed from the bolt, its characteristics are numerous varieties and specifications, different performance and uses, and a high degree of standardization, serialization, and generalization. Therefore, some people refer to this type of tight bolt fastener that already has national standards as standard fasteners, or simply