1-1/4-11.5 NPT vs 1/16-27 NPT: specs compared
Updated 05 September 2026.
42.16 mm
1-1/4-11.5 NPT wins on major diameter
On major diameter, 1-1/4-11.5 NPT leads: 42.16 mm versus 7.94 mm.
| Spec | 1-1/4-11.5 NPT | 1/16-27 NPT |
|---|---|---|
| Designation | 1-1/4-11.5 NPT | 1/16-27 NPT |
| Major diameter | 42.16 mm | 7.94 mm |
| Threads per inch / pitch | 11.5 | 27 |
| Thread form | tapered, 60 degree | tapered, 60 degree |
| Seals on | on the thread flanks with PTFE tape | on the thread flanks with PTFE tape |
Questions and answers
Which has the higher major diameter, 1-1/4-11.5 NPT or 1/16-27 NPT?
On major diameter, 1-1/4-11.5 NPT leads: 42.16 mm versus 7.94 mm.
How do 1-1/4-11.5 NPT and 1/16-27 NPT compare?
On major diameter, 1-1/4-11.5 NPT leads: 42.16 mm versus 7.94 mm.