NPT - American tapered pipe
1-1/2-11.5 NPT pipe thread: 11.5 TPI, major Ø 48.26 mm.
Profile
| Designation | 1-1/2-11.5 NPT |
|---|---|
| Major (outside) diameter | 48.26 mm · 1.9" |
| Pitch | 2.209 mm · 11.5 TPI |
| Pitch diameter | 46.825 mm · 1.8435" |
| Minor diameter (external) | 45.55 mm · 1.7933" |
| Minor diameter (internal) | 45.869 mm · 1.8059" |
| Recommended tap drill | 44.05 mm |
Pipe threads are made up to a seal against the mating flanks, not tightened to a bolt preload, so no proof load or tightening-torque figure applies.
The bolt schedule collects the fasteners for one job onto a single sheet - tap drill, wrench size, grade and tightening torque on every line, taken straight from pages like this one. Free schedules hold 3 lines and are saved in this browser only.
1-1/2-11.5 NPT is a NPT pipe thread running at 11.5 threads per inch on a 48.26 mm major diameter. NPT is a 60° tapered thread that seals on the flanks; use a tapered reamer after drilling for a full-form thread.
All values are generated from the standard thread formulas (ISO 68-1 / ASME B1.1) and published standard tables - not hand-entered. See the full reference.
Drill 44.05 mm before tapping 1-1/2-11.5 NPT. NPT is a 60° tapered thread that seals on the flanks; use a tapered reamer after drilling for a full-form thread.
1-1/2-11.5 NPT is tapered. NPT is a 60° tapered thread that seals as the flanks wedge together, normally with thread sealant or PTFE tape.
1-1/2-11.5 NPT runs at 11.5 threads per inch, a pitch of 2.209 mm, on a major diameter of 48.26 mm.
No. Pipe threads are made up to a seal against the mating flanks, not tightened to a bolt preload, so no proof load or tightening-torque figure applies.
The pipe this thread runs on
NPS 1-1/2 pipe is 1.9 in across the outside whatever the schedule; at standard wall (std) the wall is 0.145 in and the bore 1.61 in.
Full dimensions for the standard wall · every schedule in the chart
Nearby sizes