12" NPT Thread Specifications
Complete dimensions for 12" NPT pipe thread. TPI: 8, Pitch: 0.125" (3.175 mm).
Thread Dimensions
| Designation | 12" NPT |
| Nominal Pipe Size | 12" |
| TPI | 8 |
| Pitch | 0.125" (3.175 mm) |
| Outside Diameter | 12.75" (323.85 mm) |
| Pitch Diameter | 12.6688" (321.79 mm) |
| Minor Diameter | 12.5966" (319.95 mm) |
| Taper Angle | 1.7899° (1:16 taper ratio) |
| Thread Depth | 0.0866" (2.2 mm) |
Tap Drill Size
Tap drill: 12.5966" (319.95 mm)
Common Applications
- Plumbing connections
- Gas piping
- Hydraulic fittings
- Pneumatic connections