G3/8 vs G4: specs compared
Updated 05 September 2026.
113.03 mm
G4 wins on major diameter
On major diameter, G4 leads: 113.03 mm versus 16.662 mm.
| Spec | G3/8 | G4 |
|---|---|---|
| Designation | G3/8 | G4 |
| Major diameter | 16.662 mm | 113.03 mm |
| Threads per inch / pitch | 19 | 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, G3/8 or G4?
On major diameter, G4 leads: 113.03 mm versus 16.662 mm.
How do G3/8 and G4 compare?
On major diameter, G4 leads: 113.03 mm versus 16.662 mm.