G4 vs R4: specs compared
Updated 05 September 2026.
3
specs differ
G4 and R4 differ on 3 specs: designation, thread form, seals on.
| Spec | G4 | R4 |
|---|---|---|
| Designation | G4 | R4 |
| Major diameter | 113.03 mm | 113.03 mm |
| Threads per inch / pitch | 11 | 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
How do G4 and R4 compare?
G4 and R4 differ on 3 specs: designation, thread form, seals on.