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Standard ANSI Hardware
Manufacturing Processes | Applications and Design
National Standard Taper Pipe Threads Size NPT Chart - Includes both External and internal Pipe Thread Data.
Notes:
Outside Diameter D |
Nominal Pipe Size |
Threads per Inch (Pitch) |
Thread Pitch Length, P |
Pitch Diameter at External Thread Start E0 |
Hand Tight Thread Engagement
Length,L1 |
Diameter E1 |
Maximum Thread Engagement L2 |
Diameter E2 |
0.3125 |
1⁄16 |
27 |
0.03704 |
0.27118 |
0.160 |
0.28118 |
0.2611 |
0.28750 |
| 0.405 |
1⁄8 |
27 |
0.03704 |
0.36351 |
0.1615 |
0.37360 |
0.2639 |
0.38000 |
0.540 |
1⁄4 |
18 |
0.05556 |
0.47739 |
0.2278 |
0.49163 |
0.4018 |
0.50250 |
0.675 |
3⁄8 |
18 |
0.05556 |
0.61201 |
0.240 |
0.62701 |
0.4078 |
0.63750 |
0.840 |
1⁄2 |
14 |
0.07143 |
0.75843 |
0.320 |
0.77843 |
0.5337 |
0.79179 |
1.050 |
3⁄4 |
14 |
0.07143 |
0.96768 |
0.339 |
0.98887 |
0.5457 |
1.00179 |
1.315 |
1 |
11 1⁄2 |
0.08696 |
1.21363 |
0.400 |
1.23863 |
0.6828 |
1.25630 |
1.660 |
1 1⁄4 |
11 1⁄2 |
0.08696 |
1.55713 |
0.420 |
1.58338 |
0.7068 |
1.60130 |
1.900 |
1 1⁄2 |
11 1⁄2 |
0.08696 |
1.79609 |
0.420 |
1.82234 |
0.7235 |
1.84130 |
| 2.375 |
2 |
11 1⁄2 |
0.08696 |
2.26902 |
0.436 |
2.29627 |
0.7565 |
2.31630 |
| 2.875 |
2 1⁄2 |
8 |
0.12500 |
2.71953 |
0.682 |
2.76216 |
1.1375 |
2.79062 |
3.500 |
3 |
8 |
0.12500 |
3.34062 |
0.766 |
3.38850 |
1.2000 |
3.41562 |
4.000 |
3 1⁄2 |
8 |
0.12500 |
3.83750 |
0.821 |
3.88881 |
1.2500 |
3.91562 |
4.500 |
4 |
8 |
0.12500 |
4.33438 |
0.844 |
4.38712 |
1.3000 |
4.41562 |
5.563 |
5 |
8 |
0.12500 |
5.39073 |
0.937 |
5.44929 |
1.4063 |
5.47862 |
6.625 |
6 |
8 |
0.12500 |
6.44609 |
0.958 |
6.50597 |
1.5125 |
6.54062 |
8.625 |
8 |
8 |
0.12500 |
8.43359 |
1.063 |
8.50003 |
1.7125 |
8.54062 |
10.750 |
10 |
8 |
0.12500 |
10.54531 |
1.210 |
10.62094 |
1.9250 |
10.66562 |
12.750 |
12 |
8 |
0.12500 |
12.53281 |
1.360 |
12.61781 |
2.1250 |
12.66562 |
14.000 |
14 |
8 |
0.12500 |
13.77500 |
1.562 |
13.87262 |
2.2500 |
13.91562 |
16.000 |
16 |
8 |
0.12500 |
15.76250 |
1.812 |
15.87575 |
2.4500 |
15.91562 |
| 18.000 |
18 |
8 |
0.12500 |
17.75000 |
2.000 |
17.87500 |
2.6500 |
17.91562 |
20.000 |
20 |
8 |
0.12500 |
19.73750 |
2.125 |
19.87031 |
2.8500 |
19.91562 |
| 24.000 |
24 |
8 |
0.12500 |
23.71250 |
2.375 |
23.86094 |
3.2500 |
23.91562 |
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