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Thread Pitch

Coarse Thread Series - UNC Fine Thread Series - UNF 8-Thread Series - 8UN
Nominal Size and Threads Per In. Basic Pitch Dia. Section at Minor Dia. Tensile Stress Area Nominal Size and Threads Per In. Basic Pitch Dia. Section at Minor Dia. Tensile Stress Area Nominal Size and Threads Per In. Basic Pitch Dia. Section at Minor Dia. Tensile Stress Area
In. Sq in. Sq in. In. Sq in. Sq in. In. Sq in. Sq in.
3⁄8 - 16 0.3344 0.0678 0.0775 3⁄8 - 24 0.3479 0.0809 0.0878 --    -- -- -- --
7⁄16 - 14 0.3911 0.0933 0.1063 7⁄16 - 20 0.4050 0.1090 0.1187 --    -- -- -- --
1⁄2 - 13 0.4500 0.1257 0.1419 1⁄2 - 20 0.4675 0.1486 0.1599 --    -- -- -- --
9⁄16 - 12 0.5084 0.162 0.182 9⁄16 - 18 0.5264 0.189 0.203 --    -- -- -- --
5⁄8 - 11 0.5660 0.202 0.226 5⁄8 - 18 0.5889 0.240 0.256 --    -- -- -- --
3⁄4 - 10 0.6850 0.302 0.334 3⁄4 - 16 0.7094 0.351 0.373 --    -- -- -- --
7⁄8 - 9 0.8028 0.419 0.462 7⁄8 - 14 0.8286 0.480 0.509 --    -- -- -- --
1 - 8 0.9188 0.551 0.606 1 - 12 0.9459 0.625 0.663 1 - 8 0.9188 0.551 0.606
11⁄8 - 7 1.0322 0.693 0.763 11⁄8 - 12 1.0709 0.812 0.856 11⁄8 - 8 1.0438 0.728 0.790
11⁄4 - 7 1.1572 0.890 0.969 11⁄4 - 12 1.1959 1.024 1.073 11⁄4 - 8 1.1688 0.929 1.000
13⁄8 - 6 1.2667 1.054 1.155 13⁄8 - 12 1.3209 1.260 1.315 13⁄8 - 8 1.2938 1.155 1.233
11⁄2 - 6 1.3917 1.294 1.405 11⁄2 - 12 1.4459 1.521 1.581 11⁄2 - 8 1.4188 1.405 1.492
--    -- -- -- -- --    -- -- -- -- 15⁄8 - 8 1.5438 1.68 1.78
13⁄4 - 5 1.6201 1.74 1.90 --    -- -- -- -- 13⁄4 - 8 1.6688 1.98 2.08
--    -- -- -- -- --    -- -- -- -- 17⁄8 - 8 1.7938 2.30 2.41
2 - 41⁄2 1.8557 2.30 2.50 --    -- -- -- -- 2 - 8 1.9188 2.65 2.77
21⁄4 - 41⁄2 2.1057 3.02 3.25 --    -- -- -- -- 21⁄4 - 8 2.1688 3.42 3.56
21⁄2 - 4 2.3376 3.72 4.00 --    -- -- -- -- 21⁄2 - 8 2.4188 4.29 4.44
23⁄4 - 4 2.5876 4.62 4.93 --    -- -- -- -- 23⁄4 - 8 2.6688 5.26 5.43
3 - 4 2.8376 5.62 5.97 --    -- -- -- -- 3 - 8 2.9188 6.32 6.51
31⁄4 - 4 3.0876 6.72 7.10 --    -- -- -- -- 31⁄4 - 8 3.1688 7.49 7.69
31⁄2 - 4 3.3376 7.92 8.33 --    -- -- -- -- 31⁄2 - 8 3.4188 8.75 8.96
33⁄4 - 4 3.5876 9.21 9.66 --    -- -- -- -- 33⁄4 - 8 3.6688 10.11 10.34
4 - 4 3.8376 10.61 11.08 --    -- -- -- -- 4 - 8 3.9188 11.57 11.81
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