1/8
For 1/8, thread standard is BSPP; threads per inch (tpi) is 28; thread pitch (mm) is 0.907; major (outside) diameter (mm) is 9.728; minor diameter (mm) is 8.566, recorded from its source on 2026-08-12.
- Thread standard
- BSPP our reading
- Nominal size
- 1/8 verified
- Threads per inch (TPI)
- 28 verified
- Thread pitch (mm)
- 0.907 verified
- Major (outside) diameter (mm)
- 9.728 verified
- Minor diameter (mm)
- 8.566 verified
- Thread angle (degrees)
- 55 our reading
- Governing standard
- ISO 228-1 our reading
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
BSPP G 1/8 | 1/8" | 28 | 0.907 | 9.728 | 9.147 | 8.566
— machiningdoctor.com, retrieved 2026-08-12
Source
- machiningdoctor.comhttps://www.machiningdoctor.com/charts/bsp/