Home Pipe Threads 1/8" NPT

1/8" NPT Thread Specifications

Complete dimensions for 1/8" NPT pipe thread. TPI: 27, Pitch: 0.03704" (0.941 mm).

Thread Dimensions

Designation1/8" NPT
Nominal Pipe Size1/8"
TPI27
Pitch0.03704" (0.941 mm)
Outside Diameter0.405" (10.29 mm)
Pitch Diameter0.3809" (9.68 mm)
Minor Diameter0.3596" (9.13 mm)
Taper Angle1.7899° (1:16 taper ratio)
Thread Depth0.02566" (0.652 mm)

Tap Drill Size

Tap drill: 0.3596" (9.13 mm)

Common Applications