6-8 NPT vs M22 x 1 female: specs compared
Updated 05 September 2026.
168.27 mm
6-8 NPT wins on major diameter
On major diameter, 6-8 NPT leads: 168.27 mm versus 22 mm.
| Spec | 6-8 NPT | M22 x 1 female |
|---|---|---|
| Designation | 6-8 NPT | M22 x 1 female |
| Major diameter | 168.27 mm | 22.0 mm |
| Threads per inch / pitch | 8 | 1 mm pitch |
| Thread form | tapered, 60 degree | fine parallel |
| Seals on | on the thread flanks with PTFE tape | washer inside the aerator housing |
Questions and answers
Which has the higher major diameter, 6-8 NPT or M22 x 1 female?
On major diameter, 6-8 NPT leads: 168.27 mm versus 22 mm.
How do 6-8 NPT and M22 x 1 female compare?
On major diameter, 6-8 NPT leads: 168.27 mm versus 22 mm.