Home Pipe Threads 1" NPT

1" NPT Thread Specifications

Complete dimensions for 1" NPT pipe thread. TPI: 11.5, Pitch: 0.08696" (2.209 mm).

Thread Dimensions

Designation1" NPT
Nominal Pipe Size1"
TPI11.5
Pitch0.08696" (2.209 mm)
Outside Diameter1.315" (33.4 mm)
Pitch Diameter1.2585" (31.97 mm)
Minor Diameter1.2083" (30.69 mm)
Taper Angle1.7899° (1:16 taper ratio)
Thread Depth0.06025" (1.53 mm)

Tap Drill Size

Tap drill: 1.2083" (30.69 mm)

Common Applications