3-1/2-8 · Taper Pipe (NPT)
For 3-1/2-8 · Taper Pipe (NPT), thread or drill designation is 3-1/2-8; record type is tap_drill; tap drill or decimal size is 3-3/4; thread series is Taper Pipe (NPT), recorded from its source on 2026-08-28; source re-checked 2026-09-15.
- Thread or drill designation
- 3-1/2-8 our reading
- Record type
- tap_drill our reading
- Tap drill or decimal size
- 3-3/4 verified
- Thread series
- Taper Pipe (NPT) 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
3-1/2-8 | 3-3/4
— victornet.com, retrieved 2026-08-28
Source
- victornet.comhttps://www.victornet.com/reference/Tap_Drill.html