2
For 2, thread standard is BSP; threads per inch (tpi) is 11; thread pitch (mm) is 2.309; major (outside) diameter (mm) is 59.614; minor diameter (mm) is 56.656, recorded from its source on 2026-08-12.
- Thread standard
- BSP our reading
- Nominal size
- 2 verified
- Threads per inch (TPI)
- 11 verified
- Thread pitch (mm)
- 2.309 verified
- Major (outside) diameter (mm)
- 59.614 verified
- Minor diameter (mm)
- 56.656 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
2 | 11 | 2.309 | 1.479 | 59.614 | 58.135 | 56.656 |
— 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.
Major (outside) diameter (mm)
amesweb.info says major (outside) diameter (mm) is 59.614, as of 2026-08-12.
2 | 11 | 2.309 | 1.479 | 59.614 | 58.135 | 56.656 |
https://amesweb.info/Screws/BSP-Thread-Chart.aspx
htsspares.com says major (outside) diameter (mm) is 59.61, as of 2026-08-12.
2 Inch BSP | 59.61 mm / 2-1/4" | 11
https://www.htsspares.com/blog/how-to/how-to-measure-your-bsp-fittings
trimantec.com says major (outside) diameter (mm) is 59.7, as of 2026-08-12.
-32 (2) | 11 | 59.7 | 2.35 | 57.4 | 2.26
Sources
- amesweb.infohttps://amesweb.info/Screws/BSP-Thread-Chart.aspx
- htsspares.comhttps://www.htsspares.com/blog/how-to/how-to-measure-your-bsp-fittings
- trimantec.comhttps://trimantec.com/blogs/t/thread-identification-guide