Home Pipe Threads 2-1/2" NPT

2-1/2" NPT Thread Specifications

Complete dimensions for 2-1/2" NPT pipe thread. TPI: 8, Pitch: 0.125" (3.175 mm).

Thread Dimensions

Designation2-1/2" NPT
Nominal Pipe Size2-1/2"
TPI8
Pitch0.125" (3.175 mm)
Outside Diameter2.875" (73.03 mm)
Pitch Diameter2.7938" (70.96 mm)
Minor Diameter2.7216" (69.13 mm)
Taper Angle1.7899° (1:16 taper ratio)
Thread Depth0.0866" (2.2 mm)

Tap Drill Size

Tap drill: 2.7216" (69.13 mm)

Common Applications