3-1/2-6NH vs R3/4: specs compared
Updated 05 September 2026.
107.77 mm
3-1/2-6NH wins on major diameter
On major diameter, 3-1/2-6NH leads: 107.77 mm versus 26.441 mm.
| Spec | 3-1/2-6NH | R3/4 |
|---|---|---|
| Designation | 3-1/2-6NH | R3/4 |
| Major diameter | 107.77 mm | 26.441 mm |
| Threads per inch / pitch | 6 | 14 |
| Thread form | straight (parallel), 60 degree | tapered, 55 degree |
| Seals on | rubber gasket in the female swivel | on the thread flanks with PTFE tape or paste |
Questions and answers
Which has the higher major diameter, 3-1/2-6NH or R3/4?
On major diameter, 3-1/2-6NH leads: 107.77 mm versus 26.441 mm.
How do 3-1/2-6NH and R3/4 compare?
On major diameter, 3-1/2-6NH leads: 107.77 mm versus 26.441 mm.