6" NPT Thread Specifications
Complete dimensions for 6" NPT (National Pipe Taper) thread per ASME B1.20.1. TPI: 8, Pitch: 0.125" (3.175 mm).
Thread Dimensions
| Designation | 6" NPT |
| Nominal Pipe Size | 6" |
| TPI | 8 |
| Pitch | 0.125" (3.175 mm) |
| Outside Diameter | 6.625" (168.28 mm) |
| Pitch Diameter | 6.5438" (166.21 mm) |
| Minor Diameter | 6.4716" (164.38 mm) |
| Taper Angle | 1.7899° (1:16 taper ratio) |
| Thread Depth | 0.0866" (2.2 mm) |
Tap Drill Size
Tap drill: 6.4716" (164.38 mm)
Common Applications
- Plumbing connections
- Gas piping
- Hydraulic fittings
- Pneumatic connections