2-11.5 NPT vs 2-1/2-7.5NH: specs compared

Updated 05 September 2026.

77.94 mm
2-1/2-7.5NH wins on major diameter

On major diameter, 2-1/2-7.5NH leads: 77.94 mm versus 60.32 mm.

Spec2-11.5 NPT2-1/2-7.5NH
Designation2-11.5 NPT2-1/2-7.5NH
Major diameter60.32 mm77.94 mm
Threads per inch / pitch11.57.5
Thread formtapered, 60 degreestraight (parallel), 60 degree
Seals onon the thread flanks with PTFE taperubber gasket in the female swivel

Questions and answers

Which has the higher major diameter, 2-11.5 NPT or 2-1/2-7.5NH?

On major diameter, 2-1/2-7.5NH leads: 77.94 mm versus 60.32 mm.

How do 2-11.5 NPT and 2-1/2-7.5NH compare?

On major diameter, 2-1/2-7.5NH leads: 77.94 mm versus 60.32 mm.

Compared here

2" NPT (National Pipe Taper) (2-11.5 NPT)2-1/2" NH fire hose thread (NST) (2-1/2-7.5NH)