NPS 1-1/2 Pipe
Outside diameter 1.900″
OD in mm 48.26 mm
NPT thread 1-1/2″ NPT (11.5 TPI)
Every NPS 1-1/2 pipe has this OD regardless of schedule — the schedule changes only the wall thickness and bore.
Schedules
| Schedule | Wall | Wall mm | Inside diameter | ID mm |
|---|---|---|---|---|
| 40 = STD | 0.145″ | 3.683 | 1.610″ | 40.894 |
| 80 = XS | 0.200″ | 5.08 | 1.500″ | 38.1 |
1-1/2″ NPT thread
| Designation | 1-1/2″ NPT |
|---|---|
| Threads per inch | 11.5 |
| Recommended tap drill | 1-47/64″ (1.7344″ / 44.053 mm) |
NPT is a tapered thread (3/4″ per foot on diameter) — it seals on the thread flanks with sealant. The size refers to the pipe's nominal size, not any measured thread diameter.