G1/8 vs R2: specs compared
Updated 05 September 2026.
59.614 mm
R2 wins on major diameter
On major diameter, R2 leads: 59.614 mm versus 9.728 mm.
| Spec | G1/8 | R2 |
|---|---|---|
| Designation | G1/8 | R2 |
| Major diameter | 9.728 mm | 59.614 mm |
| Threads per inch / pitch | 28 | 11 |
| 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, G1/8 or R2?
On major diameter, R2 leads: 59.614 mm versus 9.728 mm.
How do G1/8 and R2 compare?
On major diameter, R2 leads: 59.614 mm versus 9.728 mm.