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