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The dimensions listed below can be used to determine the diameter along with the thread pitch. For further clarification of thread per inch, please download our gauge. The biggest external diameter of a Screw or the biggest internal diameter of a threaded hole. NOTE: The size of the hexagon of a bolt or nut has no relevance when defining a thread size. TPI: (Threads per inch) The number of thread, or 'V's along a one inch length which in turns, defines the size of the 'V' shape of the helical portion of a thread.
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