2-1/2-7.5NH vs R3: specs compared
Updated 05 September 2026.
87.884 mm
R3 wins on major diameter
On major diameter, R3 leads: 87.884 mm versus 77.94 mm.
| Spec | 2-1/2-7.5NH | R3 |
|---|---|---|
| Designation | 2-1/2-7.5NH | R3 |
| Major diameter | 77.94 mm | 87.884 mm |
| Threads per inch / pitch | 7.5 | 11 |
| 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, 2-1/2-7.5NH or R3?
On major diameter, R3 leads: 87.884 mm versus 77.94 mm.
How do 2-1/2-7.5NH and R3 compare?
On major diameter, R3 leads: 87.884 mm versus 77.94 mm.