2 1/4
For 2 1/4, thread standard is BSPP; threads per inch (tpi) is 11; thread pitch (mm) is 2.309; major (outside) diameter (mm) is 65.710; minor diameter (mm) is 62.753, recorded from its source on 2026-08-12.
- Thread standard
- BSPP our reading
- Nominal size
- 2 1/4 verified
- Threads per inch (TPI)
- 11 verified
- Thread pitch (mm)
- 2.309 verified
- Major (outside) diameter (mm)
- 65.710 verified
- Minor diameter (mm)
- 62.753 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 2 1/4 | 2 1/4" | 11 | 2.309 | 65.710 | 64.231 | 62.753
— machiningdoctor.com, retrieved 2026-08-12
Source
- machiningdoctor.comhttps://www.machiningdoctor.com/charts/bsp/