Home Pipe Threads 3" NPT

3" NPT Thread Specifications

Complete dimensions for 3" NPT pipe thread. TPI: 8, Pitch: 0.125" (3.175 mm).

Thread Dimensions

Designation3" NPT
Nominal Pipe Size3"
TPI8
Pitch0.125" (3.175 mm)
Outside Diameter3.5" (88.9 mm)
Pitch Diameter3.4188" (86.84 mm)
Minor Diameter3.3466" (85 mm)
Taper Angle1.7899° (1:16 taper ratio)
Thread Depth0.0866" (2.2 mm)

Tap Drill Size

Tap drill: 3.3466" (85.0 mm)

Common Applications