3/8
For 3/8, thread standard is BSPT; threads per inch (tpi) is 19; thread pitch (mm) is 1.337; major (outside) diameter (mm) is 16.66; minor diameter (mm) is 14.95, recorded from its source on 2026-08-12.
- Thread standard
- BSPT our reading
- Nominal size
- 3/8 verified
- Threads per inch (TPI)
- 19 verified
- Thread pitch (mm)
- 1.337 verified
- Major (outside) diameter (mm)
- 16.66 verified
- Minor diameter (mm)
- 14.95 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
<https://www.machiningdoctor.com/threadinfo-bspt/?tid=4503> BSPT R 3/8 | 3/8" | 19 | 1.337 | 6.4 | 1.0 / 1.3 | 16.66 | 15.81 | 14.95 |
— machiningdoctor.com, retrieved 2026-08-12
Source
- machiningdoctor.comhttps://www.machiningdoctor.com/charts/bsp/