Home Pipe Threads 8" NPT

8" NPT Thread Specifications

Complete dimensions for 8" NPT pipe thread. TPI: 8, Pitch: 0.125" (3.175 mm).

Thread Dimensions

Designation8" NPT
Nominal Pipe Size8"
TPI8
Pitch0.125" (3.175 mm)
Outside Diameter8.625" (219.07 mm)
Pitch Diameter8.5438" (217.01 mm)
Minor Diameter8.4716" (215.18 mm)
Taper Angle1.7899° (1:16 taper ratio)
Thread Depth0.0866" (2.2 mm)

Tap Drill Size

Tap drill: 8.4716" (215.18 mm)

Common Applications