HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 692)

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Q = 16 NPT U.S. taper pipe thread
Q = 17 NPTF U.S. taper dryseal pipe thread
Q = 18 NPSC U.S. cylindrical pipe thread with lubricant
Thread
designation Diameter
(in mm)
Thread pitch
Thread
designation Diameter
(in mm)
Thread pitch
1/16“ 7.938 0.94074074 3 1/2“ 101.6 3.175
1/8“ 10.287 0.94074074 4“ 114.3 3.175
1/4“ 13.716 1.411111111 5“ 141.3 3.175
3/8“ 17.145 1.411111111 6“ 168.275 3.175
1/2“ 21.336 1.814285714 8“ 219.075 3.175
3/4“ 26.67 1.814285714 10“ 273.05 3.175
1“ 33.401 2.208695652 12“ 323.85 3.175
1 1/4“ 42.164 2.208695652 14“ 355.6 3.175
1 1/2“ 48.26 2.208695652 16“ 406.4 3.175
2“ 60.325 2.208695652 18“ 457.2 3.175
2 1/2“ 73.025 3.175 20“ 508 3.175
3“ 88.9 3.175 24“ 609.6 3.175
Thread
designation Diameter
(in mm)
Thread pitch
Thread
designation Diameter
(in mm)
Thread pitch
1/16“ 7.938 0.94074074 1“ 33.401 2.208695652
1/8“ 10.287 0.94074074 1 1/4“ 42.164 2.208695652
1/4“ 13.716 1.411111111 1 1/2“ 48.26 2.208695652
3/8“ 17.145 1.411111111 2“ 60.325 2.208695652
1/2“ 21.336 1.814285714 2 1/2“ 73.025 3.175
3/4“ 26.67 1.814285714 3“ 88.9 3.175
Thread
designation Diameter
(in mm)
Thread pitch
Thread
designation Diameter
(in mm)
Thread pitch
1/8“ 10.287 0.94074074 1 1/2“ 48.26 2.208695652
1/4“ 13.716 1.411111111 2“ 60.325 2.208695652
3/8“ 17.145 1,411111111 2 1/2“ 73.025 3.175
1/2“ 21.336 1.814285714 3“ 88.9 3.175
3/4“ 26.67 1.814285714 3 1/2“ 101.6 3.175
1“ 33.401 2.208695652 4“ 114.3 3.175
1 1/4“ 42.164 2.208695652