Standard Thread Pitches Chart | Specification Washer Bolts Screws Nuts Fasteners - Washer Bolts Screws Nuts Fasteners Techinical Information
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Standard Thread Pitches Chart

Thread series cover designations of diameter/pitch combinations that are measured by the number of threads per inch (TPI) applied to a single diameter.

Coarse Thread Series (UNC/UNRC) is the most common designation for general application bolts and nuts. Coarse thread is beneficial, because they are less likely to cross thread, more tolerant in adverse conditions and facilitate quick assembly.

Fine Thread Series (UNF/UNRF) is commonly used in precision applications. Because of the larger tensile stress areas, they have high tension strength. However, a longer engagement is required for fine thread applications than for coarse series threads to prevent stripping.

8 - Thread Series (8UN) is the specified thread forming method for several ASTM standards including A193 B7, A193 B8/B8M, and A320. This series is used for diameters one inch and above.

Fasteners Nuts

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.
38 - 16 0.3344 0.0678 0.0775 38 - 24 0.3479 0.0809 0.0878 --    -- -- -- --
716 - 14 0.3911 0.0933 0.1063 716 - 20 0.4050 0.1090 0.1187 --    -- -- -- --
12 - 13 0.4500 0.1257 0.1419 12 - 20 0.4675 0.1486 0.1599 --    -- -- -- --
916 - 12 0.5084 0.162 0.182 916 - 18 0.5264 0.189 0.203 --    -- -- -- --
58 - 11 0.5660 0.202 0.226 58 - 18 0.5889 0.240 0.256 --    -- -- -- --
34 - 10 0.6850 0.302 0.334 34 - 16 0.7094 0.351 0.373 --    -- -- -- --
78 - 9 0.8028 0.419 0.462 78 - 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
118 - 7 1.0322 0.693 0.763 118 - 12 1.0709 0.812 0.856 118 - 8 1.0438 0.728 0.790
114 - 7 1.1572 0.890 0.969 114 - 12 1.1959 1.024 1.073 114 - 8 1.1688 0.929 1.000
138 - 6 1.2667 1.054 1.155 138 - 12 1.3209 1.260 1.315 138 - 8 1.2938 1.155 1.233
112 - 6 1.3917 1.294 1.405 112 - 12 1.4459 1.521 1.581 112 - 8 1.4188 1.405 1.492
--    -- -- -- -- --    -- -- -- -- 158 - 8 1.5438 1.68 1.78
134 - 5 1.6201 1.74 1.90 --    -- -- -- -- 134 - 8 1.6688 1.98 2.08
--    -- -- -- -- --    -- -- -- -- 178 - 8 1.7938 2.30 2.41
2 - 412 1.8557 2.30 2.50 --    -- -- -- -- 2 - 8 1.9188 2.65 2.77
214 - 4-12 2.1057 3.02 3.25 --    -- -- -- -- 214 - 8 2.1688 3.42 3.56
212 - 4 2.3376 3.72 4.00 --    -- -- -- -- 212 - 8 2.4188 4.29 4.44
234 - 4 2.5876 4.62 4.93 --    -- -- -- -- 234 - 8 2.6688 5.26 5.43
3 - 4 2.8376 5.62 5.97 --    -- -- -- -- 3 - 8 2.9188 6.32 6.51
314 - 4 3.0876 6.72 7.10 --    -- -- -- -- 314 - 8 3.1688 7.49 7.69
312 - 4 3.3376 7.92 8.33 --    -- -- -- -- 312 - 8 3.4188 8.75 8.96
334 - 4 3.5876 9.21 9.66 --    -- -- -- -- 334 - 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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