1-1/4" NPT Thread Specifications
Complete dimensions for 1-1/4" NPT pipe thread. TPI: 11.5, Pitch: 0.08696" (2.209 mm).
Thread Dimensions
| Designation | 1-1/4" NPT |
| Nominal Pipe Size | 1-1/4" |
| TPI | 11.5 |
| Pitch | 0.08696" (2.209 mm) |
| Outside Diameter | 1.66" (42.16 mm) |
| Pitch Diameter | 1.6035" (40.73 mm) |
| Minor Diameter | 1.5533" (39.45 mm) |
| Taper Angle | 1.7899° (1:16 taper ratio) |
| Thread Depth | 0.06025" (1.53 mm) |
Tap Drill Size
Tap drill: 1.5533" (39.45 mm)
Common Applications
- Plumbing connections
- Gas piping
- Hydraulic fittings
- Pneumatic connections