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Select Fittings by NPT Thread Size

NPT Size Actual Diameter Threads Per Inch
1/16" Fittings 0.3125" 27
1/8" Fittings 0.405" 27
1/4" Fittings 0.540" 18
3/8" Fittings 0.675" 18
1/2" Fittings 0.840" 14
3/4" Fittings 1.050" 14
1" Fittings 1.315" 11.5
1-1/4" Fittings 1.660" 11.5
1-1/2" Fittings 1.90" 11.5
2" Fittings 2.375" 11.5
2-1/2" Fittings 2.875" 8
3" Fittings 3.5" 8
4" Fittings 4.5" 8

NPT Thread Information:

When does 1 Inch never measure 1 Inch? Answer: when we are working with pipe threads.

  • NPT is an acronym for National Pipe Thread. NPT threads are tapered. The taper improves joint sealing.
  • NPT pipe thread sizes do not correspond to actual inch measurements. For example a 1” NPT Pipe Thread measures 1.315”.
  • Coyote Gear staff hopes this information helps people who are new to piping products get the size parts they need.

NPT Taper

 

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