National Pipe Thread - Pipe Thread Sizes

Pipe Thread Sizes

Nominal pipe size (in) Pipe outer diameter Threads per inch Thread pitch
1⁄16 0.3125 in (7.94 mm) 27 0.03704 in (0.94082 mm)
1⁄8 0.405 in (10.29 mm) 27 0.03704 in (0.94082 mm)
1⁄4 0.540 in (13.72 mm) 18 0.05556 in (1.41122 mm)
3⁄8 0.675 in (17.15 mm) 18 0.05556 in (1.41122 mm)
1⁄2 0.840 in (21.34 mm) 14 0.07143 in (1.81432 mm)
3⁄4 1.050 in (26.67 mm) 14 0.07143 in (1.81432 mm)
1 1.315 in (33.40 mm) 11 1⁄2 0.08696 in (2.20878 mm)
1 1⁄4 1.660 in (42.16 mm) 11 1⁄2 0.08696 in (2.20878 mm)
1 1⁄2 1.900 in (48.26 mm) 11 1⁄2 0.08696 in (2.20878 mm)
2 2.375 in (60.33 mm) 11 1⁄2 0.08696 in (2.20878 mm)
2 1⁄2 2.875 in (73.03 mm) 8 0.12500 in (3.175 mm)
3 3.500 in (88.90 mm) 8 0.12500 in (3.175 mm)
4 4.500 in (114.30 mm) 8 0.12500 in (3.175 mm)
5 5.563 in (141.30 mm) 8 0.12500 in (3.175 mm)
6 6.625 in (168.28 mm) 8 0.12500 in (3.175 mm)
10 10.750 in (273.05 mm) 8 0.12500 in (3.175 mm)
12 12.750 in (323.85 mm) 8 0.12500 in (3.175 mm)
14 14 in (355.60 mm) 8 0.12500 in (3.175 mm)
16 16 in (406.40 mm) 8 0.12500 in (3.175 mm)
18 18 in (457.20 mm) 8 0.12500 in (3.175 mm)
20 20 in (508.00 mm) 8 0.12500 in (3.175 mm)
24 24 in (609.60 mm) 8 0.12500 in (3.175 mm)

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