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Plumbing fitting thread diameter conversion

CORRESPONDENCE INCH TO CENTIMETER

DIMENSIONS CHART FOR PLUMBING FITTINGS

Explanatory table of diameter conversions from mm to inch concerning threads and tappings.
For industrial decoration we will retain the outer diameter here. Example for a dimension (20x27) 3/4" for a steel pipe, the outer diameter of the pipe is 27mm or 2.7cm in diameter for 3/4 inch.

  • 1/2" = (15/21) = 21mm or 2.1cm in diameter
  • 3/4" = (20/27) = 27mm or 2.7cm in diameter
  • 1" = (26/34) = 34mm or 3.4cm in diameter
  • 1"1/4 = (33/42) = 42mm or 4.2cm in diameter

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Please note: The lengths indicated concerning the pipes include the thread, between 8 and 22mm of thread fits into the female threaded part depending on the diameter:

  • 1/2" about 8 to 12 mm
  • 3/4" about 10 to 14mm
  • 1" about 12 to 17mm
  • 1"1/4 about 15 to 22mm
Please note that these are approximations which may vary by a few millimeters depending on the series of pipes. Also keep in mind that the threads are tapered, so screwing in all the way is impossible.

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