G1-1/4 vs G1/2: specs compared
Updated 05 September 2026.
41.91 mm
G1-1/4 wins on major diameter
On major diameter, G1-1/4 leads: 41.91 mm versus 20.955 mm.
| Spec | G1-1/4 | G1/2 |
|---|---|---|
| Designation | G1-1/4 | G1/2 |
| Major diameter | 41.91 mm | 20.955 mm |
| Threads per inch / pitch | 11 | 14 |
| Thread form | parallel, 55 degree | parallel, 55 degree |
| Seals on | flat washer or bonded seal on the face | flat washer |
Questions and answers
Which has the higher major diameter, G1-1/4 or G1/2?
On major diameter, G1-1/4 leads: 41.91 mm versus 20.955 mm.
How do G1-1/4 and G1/2 compare?
On major diameter, G1-1/4 leads: 41.91 mm versus 20.955 mm.