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ANSI Standard Iron Pipe Taper Threads

A = G - (0.05 + 1.1) P
B = A + .0625 F
E = P(0.8G + 6.8)
Depth of Thread = 0.8P
Total Taper 3/4 in. per foot
  A B E F G H   P  
Nominal
Size
of Pipe		 Pitch
Diameter
at End of Pipe		 Pitch Diameter
at Gauging
Notch		 Length of
Effective
Thread		 Normal
Engagement
by Hand
(Male / Female)
Thread		 Outside
Diameter
of Pipe		 Actual
Inside
Diameter
of Pipe		 Number
of
Threads		 Pitch
of
Thread		 Depth
of
Thread
Inches Inches Inches Inches Inches Inches Inches Per Inch Inch Inch
1/2 0.36351 0.37476 0.2638 0.18 0.405 0.269 27 0.37 0.02963
1/4 0.47739 0.48989 0.4018 0.2 0.54 0.364 18 0.556 0.04444
3/8 0.61201 0.62701 0.4078 0.24 0.675 0.493 18 0.556 0.04444
1/2 0.75843 0.77843 0.5337 0.32 0.84 0.622 14 0.714 0.05714
1/4 0.96768 0.98886 0.5457 0.339 1.05 0.824 14 0.714 0.05714
1 1.21363 1.23863 0.6828 0.4 1.315 1.049 11-1/2 0.087 0.06956
1-1/4 1.55713 1.58338 0.7068 0.42 1.66 1.38 11-1/2 0.087 0.06956
1-1/2 1.79609 1.82234 0.7235 0.42 1.9 1.61 11-1/2 0.087 0.06956
2 2.26902 2.29627 0.7565 0.436 2.375 2.067 11-1/2 0.087 0.06956
2-1/2 2.71953 2.76216 1.1375 0.682 2.875 2.469 8 0.125 0.1
3 3.34063 3.3885 1.2 0.766 3.5 3.068 8 0.125 0.1
3-1/2 3.8375 3.88881 1.25 0.821 4 3.548 8 0.125 0.1
4 4.33438 4.38713 1.3 0.844 4.5 4.026 8 0.125 0.1
5 5.39073 5.44929 1.4063 0.937 5.563 5.047 8 0.125 0.1
6 6.44609 6.50597 1.5125 0.958 6.625 6.065 8 0.125 0.1
8 8.43359 8.50003 1.7125 1.063 8.625 7.981 8 0.125 0.1
10 10.54531 10.62094 1.925 1.21 10.75 10.02 8 0.125 0.1
12 12.53281 12.61781 2.125 1.36 12.75 12 8 0.125 0.1
14 OD 13.775 13.87262 2.25 1.562 14 13.25 8 0.125 0.1
16 OD 15.7625 15.87575 2.45 1.812 16 15.25 8 0.125 0.1
18 OD 17.75 17.875 2.65 2 18 17.25 8 0.125 0.1
20 OD 19.7375 19.87031 2.85 2.125 20 19.25 8 0.125 0.1
22 OD 21.725 21.86562 3.05 2.25 22 21.25 8 0.125 0.1
24 OD 23.7125 23.86094 3.25 2.375 24 23.25 8 0.125 0.1

Data abstracted from the USA Standard for Pipe Threads B2.1.


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