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Thread Pitch Data

Nominal Size,
Threads perinch and
Thread Series
As Ar Ass Asn
Tensile Stress Area sq. in. Thread Root Area sq. in. Thread Stripping Areas sq. in. per in. of Engagement
External Thread Internal Thread
Class 2A Class 3A Class 2B Class 3B
0 ‐ 80 UNF 0.00180 0.00151 0.0673 0.0748 0.106 0.116
1 ‐ 64 UNC 0.00263 0.00218 0.0835 0.0913 0.133 0.144
1 ‐ 72 UNF 0.00278 0.00237 0.0831 0.0922 0.130 0.142
2 ‐ 56 UNC 0.00370 0.00310 0.101 0.109 0.162 0.174
2 ‐ 64 UNF 0.00394 0.00339 0.101 0.110 0.156 0.170
3 ‐ 48 UNC 0.00487 0.00406 0.118 0.127 0.191 0.204
3 ‐ 56 UNF 0.00523 0.00451 0.118 0.130 0.186 0.201
4 ‐ 40 UNC 0.00604 0.00496 0.138 0.147 0.221 0.235
4 ‐ 48 UNF 0.00661 0.00566 0.140 0.151 0.216 0.232
5 ‐ 40 UNC 0.00796 0.00672 0.161 0.172 0.248 0.263
5 ‐ 44 UNF 0.00830 0.00716 0.162 0.173 0.246 0.262
6 ‐ 32 UNC 0.00909 0.00745 0.180 0.189 0.281 0.296
6 ‐ 40 UNF 0.01015 0.00874 0.182 0.197 0.0274 0.292
8 ‐ 32 UNC 0.0140 0.0120 0.226 0.239 0.334 0.353
8 ‐ 36 UNF 0.0147 0.0128 0.227 0.244 0.331 0.350
10 ‐ 24 UNC 0.0175 0.0145 0.263 0.227 0.401 0.420
10 ‐ 32 UNF 0.0200 0.0175 0.275 0.289 0.389 0411
12 ‐ 24 UNC 0.0242 0.0206 0.312 0.327 0.458 0.478
12 ‐ 28 UNF 0.0258 0.0226 0.317 0.336 0.450 0.474
1/4 ‐ 20 UNC 0.0318 0.0269 0.368 0.385 0.539 0.563
1/4 ‐ 28 UNF 0.0364 0.0326 0.373 0.403 0.521 0.549
5/16 ‐ 18 UNC 0.0524 0.0454 0.470 0.502 0.682 0.710
5/16 ‐ 24 UNF 0.0580 0.0524 0.479 0.520 0.663 0.696
3/8 ‐ 16 UNC 0.0775 0.0678 0.576 0.619 0.828 0.860
3/8 ‐ 24 UNF 0.0878 0.0809 0.578 0.644 0.800 0.387
7/16 ‐ 14 UNC 0.106 0.0933 0.677 0.734 0.981 1.01
7/16 ‐ 20 UNF 0.119 0.109 0.685 0.761 0.908 0.991
1/2 ‐ 13 UNC 0.142 0.126 0.779 0.854 1.12 1.16
1/2 ‐ 20 UNF 0.160 0.149 0.799 0.887 1.08 1.13
9/16 ‐ 12 UNC 0.182 0.162 0.893 0.974 1.27 1.32
9/16 ‐ 18 UNF 0.203 0.189 0.901 1.02 1.23 1.29
5/8 ‐ 11 UNC 0.226 0.202 0.998 1.09 1.42 1.47
5/8 ‐ 18 UNF 0.256 0.240 0.998 1.13 1.37 1.43
3/4 ‐ 10 UNC 0.334 0.302 1.21 1.34 1.72 1.78
3/4 ‐ 16 UNF 0.373 0.351 1.23 1.38 1.66 1.73
7/8 ‐ 9 UNC 0.462 0.419 1.43 1.58 2.03 2.09
7/8 ‐ 14 UNF 0.0509 0.480 1.44 1.63 1.96 2.03
1 ‐ 8 UNC 0.606 0.551 1.66 1.82 2.33 2.40
1 ‐ 12 UNF 0.663 0.625 1.66 1.87 2.27 2.35
1 ‐ 14 UNS 0.680 0.646 1.67 1.89 2.23 2.33
1 ‐ 1/8 ‐ 6 UNC 0.763 0.693 1.88 2.04 2.65 2.72
1 ‐ 1/8 ‐ 8 UN 0.790 0.728 1.89 2.07 2.63 2.70
1 ‐ 1/4 ‐ 7 UNC 0.969 0.890 2.11 2.30 2.94 3.02
1 ‐ 1/4 ‐ 8 UN 1.000 0.929 2.12 2.33 2.92 3.00
1 ‐ 3/8 ‐ 6 UNC 1.16 1.05 2.34 2.52 3.27 3.35
1 ‐ 3/8 ‐ 8 UN 1.23 1.16 2.34 2.58 3.21 3.30
1 ‐ 1/2 ‐ 6 UNC 1.41 1.29 2.58 2.77 3.57 3.65
1 ‐ 1/2 ‐ 8 UN 1.49 1.41 2.57 2.84 3.50 3.61
1 ‐ 5/8 ‐ 8 UN 1.78 1.68 2.80 3.10 3.79 3.91
1 ‐ 3/4 ‐ 5 UNC 1.90 1.74 3.04 3.24 4.20 4.30
1 ‐ 3/4 ‐ 8 UN 2.08 1.98 3.03 3.35 4.08 4.21
1 ‐ 7/8 ‐ 8 UN 2.41 2.30 3.25 3.63 4.37 4.50

Note : This technical information is supplied as a courtesy by BoltPort. We do not undertake any responsibility for the accuracy of the data and its application on field. This is strictly for reference.