R3/4 vs G3/8: specs compared
Updated 05 September 2026.
26.441 mm
R3/4 wins on major diameter
On major diameter, R3/4 leads: 26.441 mm versus 16.662 mm.
| Spec | R3/4 | G3/8 |
|---|---|---|
| Designation | R3/4 | G3/8 |
| Major diameter | 26.441 mm | 16.662 mm |
| Threads per inch / pitch | 14 | 19 |
| Thread form | tapered, 55 degree | parallel, 55 degree |
| Seals on | on the thread flanks with PTFE tape or paste | flat washer or bonded seal on the face |
Questions and answers
Which has the higher major diameter, R3/4 or G3/8?
On major diameter, R3/4 leads: 26.441 mm versus 16.662 mm.
How do R3/4 and G3/8 compare?
On major diameter, R3/4 leads: 26.441 mm versus 16.662 mm.