1-1/2-11.5NPSH vs 1-1/2-11.5 NPT: specs compared

Updated 05 September 2026.

48.26 mm
1-1/2-11.5 NPT wins on major diameter

On major diameter, 1-1/2-11.5 NPT leads: 48.26 mm versus 47.7 mm.

Spec1-1/2-11.5NPSH1-1/2-11.5 NPT
Designation1-1/2-11.5NPSH1-1/2-11.5 NPT
Major diameter47.7 mm48.26 mm
Threads per inch / pitch11.511.5
Thread formstraight (parallel), 60 degreetapered, 60 degree
Seals ongasket in the couplingon the thread flanks with PTFE tape

Questions and answers

Which has the higher major diameter, 1-1/2-11.5NPSH or 1-1/2-11.5 NPT?

On major diameter, 1-1/2-11.5 NPT leads: 48.26 mm versus 47.7 mm.

How do 1-1/2-11.5NPSH and 1-1/2-11.5 NPT compare?

On major diameter, 1-1/2-11.5 NPT leads: 48.26 mm versus 47.7 mm.

Compared here

1-1/2" NPSH straight hose thread (1-1/2-11.5NPSH)1-1/2" NPT (National Pipe Taper) (1-1/2-11.5 NPT)