A bolt is a form of threaded fastener with an external male thread requiring a matching pre-formed female thread such as a nut. Bolts are very closely related to screws.Omega Replica Shank: The smooth, threadless part of the bolt. Radius: The curve between the shank and the head. Head: The part of the bolt that a torque tool can hold for tightening or loosening.Patek Philippe Replica Watches Thread length: The length of the thread, which varies according to its intended purpose.The company has a state-of-the-art Bolt manufacturing section well equipped with a contemporary setup of imported high speed multi stationed Bolt formers, Bolt headers & High speed thread rolling machines.