3 NPT Thread Dimensions

Standard: ANSI B 1.20.1
Pitch of thread: 3.175
Thread Angle: 60°
Taper Angle: 1°47′
Nominal Pipe Size: 2″
Outside Dia(D): 88.9 mm
Pitch diameter at plane of hand-tight engagement (E): 86.068 mm
position of handtight engagement(L1):19.456mm/6.13Gg
usefull external thread(L2): 30.480mm
external thread with complete thread profile(L4): 24.130mm
Tapping Drill Size: 81.50 mm