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      Thread pitch is the distance between the same point on adjacent threads of a screw and can be referred to as TPI or threads per inch. A pitch gauge can be used to check thread pitch giving you an approximate measurement based on already determined thread standards. For a precise measurement you will need to use a caliper to measure the distance between the crests of two threads.

      You can also calculate thread pitch by measuring the entire length of the thread of a screw and counting the total number of threads. You can then divide the thread length by total number of threads to calculate the thread pitch.

      TP = L / n

      TP = Thread Pitch
       = Length
      n   = Number of threads

       

       

      TPI = n / L

      TPI = Threads per inch
      n = Number of threads
      L = Length of thread

       

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