G1 vs 1-11.5NPSH: specs compared
Updated 05 September 2026.
33.249 mm
G1 wins on major diameter
On major diameter, G1 leads: 33.249 mm versus 32.89 mm.
| Spec | G1 | 1-11.5NPSH |
|---|---|---|
| Designation | G1 | 1-11.5NPSH |
| Major diameter | 33.249 mm | 32.89 mm |
| Threads per inch / pitch | 11 | 11.5 |
| Thread form | parallel, 55 degree | straight (parallel), 60 degree |
| Seals on | flat washer or bonded seal on the face | gasket in the coupling |
Questions and answers
Which has the higher major diameter, G1 or 1-11.5NPSH?
On major diameter, G1 leads: 33.249 mm versus 32.89 mm.
How do G1 and 1-11.5NPSH compare?
On major diameter, G1 leads: 33.249 mm versus 32.89 mm.