Hex Head Set Bolts
Hex bolts are used to fasten two or more parts together to form an assembly either because it cannot be manufactured as a single part or to allow for maintenance and repair disassembly. By definition "a bolt is a headed and externally threaded mechanical device designed for insertion through holes in assembled part to mate with a nut and is normally intended to be tightened or released by turning that nut." When used with a preformed internally threaded (tapped) hole.
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