British Standard Pipe Thread - Thread Form

Thread Form

  • the threadform follows the British Standard Whitworth standard
  • symmetrical V-thread in which the angle between the flanks is 55° (measured in an axial plane)
  • one-sixth of this sharp V is truncated at the top and the bottom
  • the threads are rounded equally at crests and roots by circular arcs ending tangentially with the flanks
  • the theoretical depth of the thread is therefore 0.64 times the nominal pitch

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