R2-1/2 vs G3: specs compared
Updated 05 September 2026.
87.884 mm
G3 wins on major diameter
On major diameter, G3 leads: 87.884 mm versus 75.184 mm.
| Spec | R2-1/2 | G3 |
|---|---|---|
| Designation | R2-1/2 | G3 |
| Major diameter | 75.184 mm | 87.884 mm |
| Threads per inch / pitch | 11 | 11 |
| 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, R2-1/2 or G3?
On major diameter, G3 leads: 87.884 mm versus 75.184 mm.
How do R2-1/2 and G3 compare?
On major diameter, G3 leads: 87.884 mm versus 75.184 mm.