1/4 NPT Thread

Standard: ANSI B 1.20.1
Pitch of thread: 1.41
Thread Angle: 60°
Taper Angle: 1°47′
Nominal Pipe Size: 1/4″
Outside Dia(D): 13.716 mm
Pitch diameter at plane of hand-tight engagement (E): 12.487 mm
position of handtight engagement(L1): 5.786mm/ 4.10Gg
usefull external thread(L2): 10.206mm
external thread with complete thread profile(L4): 7.384mm
Tapping Drill Size: 10.70 mm