1/4-18 NPT vs G2: specs compared
Updated 05 September 2026.
59.614 mm
G2 wins on major diameter
On major diameter, G2 leads: 59.614 mm versus 13.72 mm.
| Spec | 1/4-18 NPT | G2 |
|---|---|---|
| Designation | 1/4-18 NPT | G2 |
| Major diameter | 13.72 mm | 59.614 mm |
| Threads per inch / pitch | 18 | 11 |
| Thread form | tapered, 60 degree | parallel, 55 degree |
| Seals on | on the thread flanks with PTFE tape | flat washer or bonded seal on the face |
Questions and answers
Which has the higher major diameter, 1/4-18 NPT or G2?
On major diameter, G2 leads: 59.614 mm versus 13.72 mm.
How do 1/4-18 NPT and G2 compare?
On major diameter, G2 leads: 59.614 mm versus 13.72 mm.