1/2 NPT Thread

Standard: ANSI B 1.20.1
Pitch of thread: 1.814
Thread Angle: 60°
Taper Angle: 1°47′
Nominal Pipe Size: 1/2″
Outside Dia(D): 21.336 mm
Pitch diameter at plane of hand-tight engagement (E): 19.772 mm
position of handtight engagement(L1): 8.128mm/ 4.48Gg
usefull external thread(L2): 13.556mm
external thread with complete thread profile(L4): 9.929mm
Tapping Drill Size: 17.40 mm