4
For 4, thread standard is BSPT; threads per inch (tpi) is 11; thread pitch (mm) is 2.309; major (outside) diameter (mm) is 113.03; minor diameter (mm) is 110.07, recorded from its source on 2026-08-12.
- Thread standard
- BSPT our reading
- Nominal size
- 4 verified
- Threads per inch (TPI)
- 11 verified
- Thread pitch (mm)
- 2.309 verified
- Major (outside) diameter (mm)
- 113.03 verified
- Minor diameter (mm)
- 110.07 verified
- Thread angle (degrees)
- 55 our reading
- Governing standard
- ISO 7-1 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
BSPT R 4 | 4" | 11 | 2.309 | 25.4 | 1.5 / 3.5 | 113.03 | 111.55 | 110.07 | 0 | -999.00
— machiningdoctor.com, retrieved 2026-08-12
Source
- machiningdoctor.comhttps://www.machiningdoctor.com/charts/bsp/