BSPP thread, nominal size 1/2 — dimensions
For BSPP thread, nominal size 1/2, threads per inch (tpi) is 14; thread pitch (mm) is 1.814; major (outside) diameter (mm) is 20.955; minor diameter (mm) is 18.632; thread angle (degrees) is 55; governing standard is ISO 228-1, recorded from its source on 2026-08-12.
- Thread standard
- BSPP our reading
- Nominal size
- 1/2 verified
- Threads per inch (TPI)
- 14 verified
- Thread pitch (mm)
- 1.814 verified
- Major (outside) diameter (mm)
- 20.955 verified
- Minor diameter (mm)
- 18.632 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 1/2 | 1/2" | 14 | 1.814 | 20.955 | 19.793 | 18.632
— machiningdoctor.com, retrieved 2026-08-12
Source
- machiningdoctor.comhttps://www.machiningdoctor.com/charts/bsp/