1/8-27 NPT vs 2-11.5 NPT: specs compared
Updated 05 September 2026.
60.32 mm
2-11.5 NPT wins on major diameter
On major diameter, 2-11.5 NPT leads: 60.32 mm versus 10.29 mm.
| Spec | 1/8-27 NPT | 2-11.5 NPT |
|---|---|---|
| Designation | 1/8-27 NPT | 2-11.5 NPT |
| Major diameter | 10.29 mm | 60.32 mm |
| Threads per inch / pitch | 27 | 11.5 |
| 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, 1/8-27 NPT or 2-11.5 NPT?
On major diameter, 2-11.5 NPT leads: 60.32 mm versus 10.29 mm.
How do 1/8-27 NPT and 2-11.5 NPT compare?
On major diameter, 2-11.5 NPT leads: 60.32 mm versus 10.29 mm.