1-1/2-9NH vs G1-1/4: specs compared
Updated 05 September 2026.
50.55 mm
1-1/2-9NH wins on major diameter
On major diameter, 1-1/2-9NH leads: 50.55 mm versus 41.91 mm.
| Spec | 1-1/2-9NH | G1-1/4 |
|---|---|---|
| Designation | 1-1/2-9NH | G1-1/4 |
| Major diameter | 50.55 mm | 41.91 mm |
| Threads per inch / pitch | 9 | 11 |
| Thread form | straight (parallel), 60 degree | parallel, 55 degree |
| Seals on | rubber gasket in the female swivel | flat washer or bonded seal on the face |
Questions and answers
Which has the higher major diameter, 1-1/2-9NH or G1-1/4?
On major diameter, 1-1/2-9NH leads: 50.55 mm versus 41.91 mm.
How do 1-1/2-9NH and G1-1/4 compare?
On major diameter, 1-1/2-9NH leads: 50.55 mm versus 41.91 mm.