2 1/2
For 2 1/2, thread standard is BSPP; threads per inch (tpi) is 11; thread pitch (mm) is 2.309; major (outside) diameter (mm) is 75.184; minor diameter (mm) is 72.227, recorded from its source on 2026-08-12.
- Thread standard
- BSPP our reading
- Nominal size
- 2 1/2 verified
- Threads per inch (TPI)
- 11 verified
- Thread pitch (mm)
- 2.309 verified
- Major (outside) diameter (mm)
- 75.184 verified
- Minor diameter (mm)
- 72.227 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 1/2 | 2 1/2" | 11 | 2.309 | 75.184 | 73.705 | 72.227
— machiningdoctor.com, retrieved 2026-08-12
Source
- machiningdoctor.comhttps://www.machiningdoctor.com/charts/bsp/