G1/8 vs G2: specs compared
Updated 05 September 2026.
59.614 mm
G2 wins on major diameter
On major diameter, G2 leads: 59.614 mm versus 9.728 mm.
| Spec | G1/8 | G2 |
|---|---|---|
| Designation | G1/8 | G2 |
| Major diameter | 9.728 mm | 59.614 mm |
| Threads per inch / pitch | 28 | 11 |
| Thread form | parallel, 55 degree | parallel, 55 degree |
| Seals on | flat washer or bonded seal on the face | flat washer or bonded seal on the face |
Questions and answers
Which has the higher major diameter, G1/8 or G2?
On major diameter, G2 leads: 59.614 mm versus 9.728 mm.
How do G1/8 and G2 compare?
On major diameter, G2 leads: 59.614 mm versus 9.728 mm.