1 1/4 NPT thread dimensions
ASME B1.20.1 · Taper 1:16 · 60°
Dimensions
- Major diameter
- 42.164 mm1.6600 in
- Pitch
- 2.209 mm11.5 TPI
- Thread height
- 1.767 mmbasic profile, before tolerances
- Standard
- ASME B1.20.1
- Form
- Taper 1:16
- Flank angle
- 60°
- Seals on
- Thread + sealant
- Used for
- Process connections
For taper threads the diameter is the nominal pipe outside diameter used for identification; the thread diameter changes along the length at a taper of 1:16.
Thread profile
Schematic: flank angle and pitch-to-depth proportions to scale.
Easily confused with
No other thread in the reference table has a pitch within 4 % and a diameter within 1.5 mm of this one.
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