1/2-14 NPT vs G1/4: specs compared
Updated 05 September 2026.
21.34 mm
1/2-14 NPT wins on major diameter
On major diameter, 1/2-14 NPT leads: 21.34 mm versus 13.157 mm.
| Spec | 1/2-14 NPT | G1/4 |
|---|---|---|
| Designation | 1/2-14 NPT | G1/4 |
| Major diameter | 21.34 mm | 13.157 mm |
| Threads per inch / pitch | 14 | 19 |
| 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, 1/2-14 NPT or G1/4?
On major diameter, 1/2-14 NPT leads: 21.34 mm versus 13.157 mm.
How do 1/2-14 NPT and G1/4 compare?
On major diameter, 1/2-14 NPT leads: 21.34 mm versus 13.157 mm.