G1 vs 1-11.5 NPT: specs compared
Updated 05 September 2026.
33.4 mm
1-11.5 NPT wins on major diameter
On major diameter, 1-11.5 NPT leads: 33.4 mm versus 33.249 mm.
| Spec | G1 | 1-11.5 NPT |
|---|---|---|
| Designation | G1 | 1-11.5 NPT |
| Major diameter | 33.249 mm | 33.4 mm |
| Threads per inch / pitch | 11 | 11.5 |
| Thread form | parallel, 55 degree | tapered, 60 degree |
| Seals on | flat washer or bonded seal on the face | on the thread flanks with PTFE tape |
Questions and answers
Which has the higher major diameter, G1 or 1-11.5 NPT?
On major diameter, 1-11.5 NPT leads: 33.4 mm versus 33.249 mm.
How do G1 and 1-11.5 NPT compare?
On major diameter, 1-11.5 NPT leads: 33.4 mm versus 33.249 mm.