3
For 3, thread standard is BSP; threads per inch (tpi) is 11; thread pitch (mm) is 2.309; major (outside) diameter (mm) is 87.884; minor diameter (mm) is 84.926, recorded from its source on 2026-08-12.
- Thread standard
- BSP our reading
- Nominal size
- 3 verified
- Threads per inch (TPI)
- 11 verified
- Thread pitch (mm)
- 2.309 verified
- Major (outside) diameter (mm)
- 87.884 verified
- Minor diameter (mm)
- 84.926 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
3 | 11 | 2.309 | 1.479 | 87.884 | 86.405 | 84.926 |
— amesweb.info, retrieved 2026-08-12
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
Minor diameter (mm)
amesweb.info says minor diameter (mm) is 84.926, as of 2026-08-12.
3 | 11 | 2.309 | 1.479 | 87.884 | 86.405 | 84.926 |
https://amesweb.info/Screws/BSP-Thread-Chart.aspx
geminivalve.com says minor diameter (mm) is 84.927, as of 2026-08-12.
3 | 11 | 0.0909 | 2.309 | 3.46 | 87.884 | 3.3436 | 84.927 | 0.8125 | 20.638
Sources
- amesweb.infohttps://amesweb.info/Screws/BSP-Thread-Chart.aspx
- geminivalve.comhttps://www.geminivalve.com/bsp-thread-vs-npt-fitting/