Machinery's Handbook, 31st Edition
BOLTS, SCREWS, AND NUTS 1677 Table 7. American National Standard and Unified Standard Hex Nuts and Jam Nuts and Heavy Hex Nuts and Jam Nuts ANSI/ASME B18.2.2-2015 Nominal Size or Basic Major Dia. of Thread Width Across Flats F Width Across Corners G Thickness, Nuts H Thickness, Jam Nuts H 1 Basic Max. Min. Max. Min. Basic Max. Min. Basic Max. Min. Hex Nuts (Fig. 5) and Hex Jam Nuts (Fig. 6) 1 ∕ 4 0.2500 7 ∕ 16 0.438 0.428 0.505 0.488 7 ∕ 32 0.226 0.212 5 ∕ 32 0.163 0.150 5 ∕ 16 0.3125 1 ∕ 2 0.500 0.489 0.577 0.557 17 ∕ 64 0.273 0.258 3 ∕ 16 0.195 0.180 3 ∕ 8 0.3750 9 ∕ 16 0.562 0.551 0.650 0.628 21 ∕ 64 0.337 0.320 7 ∕ 32 0.227 0.210 7 ∕ 16 0.4375 11 ∕ 16 0.688 0.675 0.794 0.768 3 ∕ 8 0.385 0.365 1 ∕ 4 0.260 0.240 1 ∕ 2 0.5000 3 ∕ 4 0.750 0.736 0.866 0.840 7 ∕ 16 0.448 0.427 5 ∕ 16 0.323 0.302 9 ∕ 16 0.5625 7 ∕ 8 0.875 0.861 1.010 0.982 31 ∕ 64 0.496 0.473 5 ∕ 16 0.324 0.301 5 ∕ 8 0.6250 15 ∕ 16 0.938 0.922 1.083 1.051 35 ∕ 64 0.559 0.535 3 ∕ 8 0.387 0.363 3 ∕ 4 0.7500 1 1 ∕ 8 1.125 1.088 1.299 1.240 41 ∕ 64 0.665 0.617 27 ∕ 64 0.446 0.398 7 ∕ 8 0.8750 1 5 ∕ 16 1.312 1.269 1.516 1.447 3 ∕ 4 0.776 0.724 31 ∕ 64 0.510 0.458 1 1.0000 1 1 ∕ 2 1.500 1.450 1.732 1.653 55 ∕ 64 0.887 0.831 35 ∕ 64 0.575 0.519 1 1 ∕ 8 1.1250 1 11 ∕ 16 1.688 1.631 1.949 1.859 31 ∕ 32 0.999 0.939 39 ∕ 64 0.639 0.579 1 1 ∕ 4 1.2500 1 7 ∕ 8 1.875 1.812 2.165 2.066 1 1 ∕ 16 1.094 1.030 23 ∕ 32 0.751 0.687 1 3 ∕ 8 1.3750 2 1 ∕ 16 2.062 1.994 2.382 2.273 1 11 ∕ 64 1.206 1.138 25 ∕ 32 0.815 0.747 1 1 ∕ 2 1.5000 2 1 ∕ 4 2.250 2.175 2.598 2.480 1 9 ∕ 32 1.317 1.245 27 ∕ 32 0.880 0.808 Heavy Hex Nuts (Fig. 5) and Heavy Hex Jam Nuts (Fig. 6) 1 ∕ 4 0.2500 1 ∕ 2 0.500 0.488 0.577 0.556 15 ∕ 64 0.250 0.218 11 ∕ 64 0.188 0.156 5 ∕ 16 0.3125 9 ∕ 16 0.562 0.546 0.650 0.622 19 ∕ 64 0.314 0.280 13 ∕ 64 0.220 0.186 3 ∕ 8 0.3750 11 ∕ 16 0.688 0.669 0.794 0.763 23 ∕ 64 0.377 0.341 15 ∕ 64 0.252 0.216 7 ∕ 16 0.4375 3 ∕ 4 0.750 0.728 0.866 0.830 27 ∕ 64 0.441 0.403 17 ∕ 64 0.285 0.247 1 ∕ 2 0.5000 7 ∕ 8 0.875 0.850 1.010 0.969 31 ∕ 64 0.504 0.464 19 ∕ 64 0.317 0.277 9 ∕ 16 0.5625 15 ∕ 16 0.938 0.909 1.083 1.037 35 ∕ 64 0.568 0.526 21 ∕ 64 0.349 0.307 5 ∕ 8 0.6250 1 1 ∕ 16 1.062 1.031 1.227 1.1175 39 ∕ 64 0.631 0.587 23 ∕ 64 0.381 0.337 3 ∕ 4 0.7500 1 1 ∕ 4 1.250 1.212 1.443 1.382 47 ∕ 64 0.758 0.710 27 ∕ 64 0.446 0.398 7 ∕ 8 0.8750 1 7 ∕ 16 1.438 1.394 1660 1.589 55 ∕ 64 0.885 0.833 31 ∕ 64 0.510 0.458 1 1.0000 1 5 ∕ 8 1.625 1.575 1.876 1.796 63 ∕ 64 1.012 0.956 35 ∕ 64 0.575 0.519 1 1 ∕ 8 1.1250 1 13 ∕ 16 1.812 1.756 2.093 2.002 1 7 ∕ 64 1.139 1.079 39 ∕ 64 0.639 0.579 1 1 ∕ 4 1.2500 2 2.000 1.938 2.309 2.209 1 7 ∕ 32 1.251 1.187 23 ∕ 32 0.751 0.687 1 3 ∕ 8 1.3750 2 3 ∕ 16 2.188 2.119 2.526 2.416 1 11 ∕ 32 1.378 1.310 25 ∕ 32 0.815 0.747 1 1 ∕ 2 1.5000 2 3 ∕ 8 2.375 2.300 2.742 2.622 1 15 ∕ 32 1.505 1.433 27 ∕ 32 0.880 0.808 1 5 ∕ 8 1.6250 2 9 ∕ 16 2.562 2.481 2.959 2.828 1 19 ∕ 32 1.632 1.556 29 ∕ 32 0.944 0.868 1 3 ∕ 4 1.7500 2 3 ∕ 4 2.750 2.662 3.175 3.035 1 23 ∕ 32 1.759 1.679 31 ∕ 32 1.009 0.929 1 7 ∕ 8 1.8750 2 15 ∕ 16 2.938 2.844 3.392 3.242 1 27 ∕ 32 1.886 1.802 1 1 ∕ 32 1.073 0.989 2 2.0000 3 1 ∕ 8 3.125 3.025 3.608 3.449 1 31 ∕ 32 2.013 1.925 1 3 ∕ 32 1.138 1.050 2 1 ∕ 4 2.2500 3 1 ∕ 2 3.500 3.388 4.041 3.862 2 13 ∕ 64 2.251 2.155 1 13 ∕ 64 1.251 1.155 2 1 ∕ 2 2.5000 3 7 ∕ 8 3.875 3.750 4.474 4.275 2 29 ∕ 64 2.505 2.401 1 29 ∕ 64 1.505 1.401 2 3 ∕ 4 2.7500 4 1 ∕ 4 4.250 4.112 4.907 4.688 2 45 ∕ 64 2.759 2.647 1 37 ∕ 64 1.634 1.522 3 3.0000 4 5 ∕ 8 4.625 4.475 5.340 5.102 2 61 ∕ 64 3.013 2.893 1 45 ∕ 64 1.763 1.643 3 1 ∕ 4 3.2500 5 5.000 4.838 5.774 5.515 3 3 ∕ 16 3.252 3.124 1 13 ∕ 16 1.876 1.748 3 1 ∕ 2 3.5000 5 3 ∕ 8 5.375 5.200 6.207 5.928 3 7 ∕ 16 3.506 3.370 1 15 ∕ 16 2.006 1.870 3 3 ∕ 4 3.7500 5 3 ∕ 4 5.750 5.562 6.640 6.341 3 11 ∕ 16 3.760 3.616 2 1 ∕ 16 2.134 1.990 4 4.0000 6 1 ∕ 8 6.125 5.925 7.073 6.755 3 15 ∕ 16 4.014 3.862 2 3 ∕ 16 2.264 2.112 All dimensions are in inches. Bold type shows nuts unified dimensionally with British and Canadian Standards. Threads are Unified Coarse-, Fine-, or 8-thread series (UNC, UNF or 8UN), Class 2B. Unification of fine-thread nuts is limited to sizes 1 inch and under.
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