Machinery's Handbook, 31st Edition
1674
BOLTS, SCREWS, AND NUTS Table 4. American National Standard and Unified Standard Heavy Hex Screws and Hex Cap Screws ANSI/ASME B18.2.1-2012 Nominal Size a or Basic Product Dia. Body Dia. E Width Across Flats F Width Across Corners G Height H Thread Length b L T Max. Min. Basic Max. Min. Max. Min. Basic Max. Min. Basic HEAVY HEX SCREWS (Fig. 4) 3 ⁄ 8 0.3750 0.3750 0.360 11 ⁄ 16 0.688 0.669 0.794 0.763 15 ⁄ 64 0.243 0.226 1.000 1 ⁄ 2 0.5000 0.5000 0.482 7 ⁄ 8 0.875 0.850 1.010 0.969 5 ⁄ 16 0.323 0.302 1.250 5 ⁄ 8 0.6250 0.6250 0.605 1 1 ⁄ 16 1.062 1.031 1.227 1.175 25 ⁄ 64 0.403 0.378 1.500 3 ⁄ 4 0.7500 0.7500 0.729 1 1 ⁄ 4 1.250 1.212 1.443 1.383 15 ⁄ 32 0.483 0.455 1.750 7 ⁄ 8 0.8750 0.8750 0.852 1 7 ⁄ 16 1.438 1.394 1.660 1.589 35 ⁄ 64 0.563 0.531 2.000 1 1.0000 1.0000 0.976 1 5 ⁄ 8 1.625 1.575 1.876 1.796 39 ⁄ 64 0.627 0.591 2.250 1 1 ⁄ 8 1.1250 1.1250 1.098 1 13 ⁄ 16 1.812 1.756 2.093 2.002 11 ⁄ 16 0.718 0.658 2.500 1 1 ⁄ 4 1.2500 1.2500 1.223 2 2.000 1.938 2.309 2.209 25 ⁄ 32 0.813 0.749 2.750 1 3 ⁄ 8 1.3750 1.3750 1.345 2 3 ⁄ 16 2.188 2.119 2.526 2.416 27 ⁄ 32 0.878 0.810 3.000 1 1 ⁄ 2 1.5000 1.5000 1.470 2 5 ⁄ 8 2.375 2.300 2.742 2.622 15 ⁄ 16 0.974 0.902 3.250 1 5 ⁄ 8 1.6250 1.6250 1.591 2 9 ⁄ 16 2.562 2.481 2.959 2.829 1 1.038 0.962 3.500 1 3 ⁄ 4 1.7500 1.7500 1.716 2 3 ⁄ 4 2.750 2.662 3.175 3.035 1 3 ⁄ 32 1.134 1.054 3.750 1 7 ⁄ 8 1.8750 1.8750 1.839 2 15 ⁄ 16 2.938 2.844 3.392 3.242 1 5 ⁄ 32 1.198 1.114 4.000 2 2.0000 2.0000 1.964 3 1 ⁄ 8 3.125 3.025 3.608 3.449 1 7 ⁄ 32 1.263 1.175 4.250 2 1 ⁄ 4 2.2500 2.2500 2.214 3 1 ⁄ 2 3.500 3.388 4.041 3.862 1 3 ⁄ 8 1.423 1.327 5.000 c 2 1 ⁄ 2 2.5000 2.5000 2.461 3 7 ⁄ 8 3.875 3.750 4.474 4.275 1 17 ⁄ 32 1.583 1.479 5.500 c 2 3 ⁄ 4 2.7500 2.7500 2.711 4 1 ⁄ 4 4.250 41.112 4.907 4.688 1 11 ⁄ 16 1.744 1.632 6.000 c 3 3.0000 3.0000 2.961 4 5 ⁄ 8 4.625 4.475 5.340 5.102 1 7 ⁄ 8 1.935 1.815 6.500 c 3 1 ⁄ 4 3.2500 3.2500 3.210 5 5.000 4.838 5.774 5.515 2 2.126 1.998 7.000 c 3 1 ⁄ 2 3.5000 3.5000 3.461 5 3 ⁄ 8 5.375 5.200 6.207 5.928 2 1 ⁄ 4 2.256 2.120 7.500 c 3 3 ⁄ 4 3.7500 3.7500 3.711 5 3 ⁄ 4 5.750 5.562 6.640 6.341 2 3 ⁄ 8 2.447 2.303 8.000 c 4 4.0000 4.0000 3.961 6 1 ⁄ 8 6.125 5.925 7.073 6.755 2 1 ⁄ 2 2.576 2.424 8.500 c 4 1 ⁄ 4 4.2500 4.2500 4.223 6 1 ⁄ 2 6.500 6.288 7.506 7.168 2 3 ⁄ 4 2.768 2.608 9.000 c 4 1 ⁄ 2 4.5000 4.5000 4.473 6 7 ⁄ 8 6.875 6.650 7.939 7.581 2 7 ⁄ 8 2.896 2.728 9.500 c 4 3 ⁄ 4 4.7500 4.7500 4.723 7 1 ⁄ 4 7.250 7.012 8.372 7.994 3 3.088 2.912 10.000 c 5 5.0000 5.0000 4.973 7 5 ⁄ 8 7.625 7.375 8.805 8.408 3 1 ⁄ 8 3.217 3.033 10.500 c 5 1 ⁄ 4 5.2500 5.2500 5.223 8 8.000 7.738 9.238 8.821 3 3 ⁄ 8 3.408 3.216 11.000 c 5 1 ⁄ 2 5.5000 5.5000 5.473 8 3 ⁄ 8 8.375 8.100 9.671 9.234 3 1 ⁄ 2 3.538 3.338 11.500 c 5 3 ⁄ 4 5.7500 5.7500 5.723 8 3 ⁄ 4 8.750 8.462 10.104 9.647 3 5 ⁄ 8 3.729 3.521 12.000 c 6 5.0000 5.0000 5.973 9 1 ⁄ 8 9.125 8.825 10.537 10.060 3 3 ⁄ 4 3.858 3.642 12.500 c HEX CAP SCREWS (Finished Hex Bolts) (Fig. 4) 1 ⁄ 4 0.2500 0.2500 0.2450 7 ⁄ 16 0.438 0.428 0.505 0.488 5 ⁄ 32 0.163 0.150 0.750 5 ⁄ 16 0.3125 0.3125 0.3065 1 ⁄ 2 0.500 0.489 0.577 0.557 13 ⁄ 64 0.211 0.195 0.875 3 ⁄ 8 0.3750 0.3750 0.3690 9 ⁄ 16 0.562 0.551 0.650 0.628 15 ⁄ 64 0.243 0.226 1.000 7 ⁄ 16 0.4375 0.4375 0.4305 5 ⁄ 8 0.625 0.612 0.722 0.698 9 ⁄ 32 0.291 0.272 1.125 1 ⁄ 2 0.5000 0.5000 0.4930 3 ⁄ 4 0.750 0.736 0.866 0.840 5 ⁄ 16 0.323 0.302 1.250 9 ⁄ 16 0.5625 0.5625 0.5545 1 3 ⁄ 16 0.812 0.798 0.938 0.910 23 ⁄ 64 0.371 0.348 1.375 5 ⁄ 8 0.6250 0.6250 0.6170 1 5 ⁄ 16 0.938 0.922 1.083 1.051 25 ⁄ 64 0.403 0.378 1.500 3 ⁄ 4 0.7500 0.7500 0.7410 1 1 ⁄ 8 1.125 1.100 1.299 1.254 15 ⁄ 32 0.483 0.455 1.750 7 ⁄ 8 0.8750 0.8750 0.8660 1 5 ⁄ 16 1.312 1.285 1.516 1.465 35 ⁄ 64 0.563 0.531 2.000 1 1.0000 1.0000 0.9900 1 1 ⁄ 2 1.500 1.469 1.732 1.675 39 ⁄ 64 0.627 0.591 2.250 1 1 ⁄ 8 1.1250 1.1250 1.1140 1 11 ⁄ 16 1.688 1.631 1.949 1.859 11 ⁄ 16 0.718 0.658 2.500 1 1 ⁄ 4 1.2500 1.2500 1.2390 1 7 ⁄ 8 1.875 1.812 2.165 2.066 25 ⁄ 32 0.813 0.749 2.750 1 3 ⁄ 8 1.3750 1.3750 1.3630 2 1 ⁄ 16 2.062 1.994 2.382 2.273 27 ⁄ 32 0.878 0.810 3.000 1 1 ⁄ 2 1.5000 1.5000 1.4880 2 1 ⁄ 4 2.250 2.175 2.598 2.480 15 ⁄ 16 0.974 0.902 3.250 1 5 ⁄ 8 1.6250 1.6250 1.6130 2 7 ⁄ 16 2.438 2.356 2.815 2.686 1 1.038 0.962 3.500 1 3 ⁄ 4 1.7500 1.7500 1.7380 2 5 ⁄ 8 2.625 2.538 3.031 2.893 1 3 ⁄ 32 1.134 1.054 3.750 1 7 ⁄ 8 1.8750 1.8750 1.8630 2 13 ⁄ 16 2.812 2.719 3.248 3.099 1 5 ⁄ 32 1.198 1.114 4.000 2 2.0000 2.0000 1.9880 3 3.000 2.900 3.464 3.306 1 7 ⁄ 32 1.263 1.175 4.250 2 1 ⁄ 4 2.2500 2.2500 2.2380 3 3 ⁄ 8 3.375 3.262 3.897 3.719 1 3 ⁄ 8 1.423 1.327 5.000 c 2 1 ⁄ 2 2.5000 2.5000 2.4880 3 3 ⁄ 4 3.750 3.625 4.330 4.133 1 17 ⁄ 32 1.583 1.479 5.500 c 2 3 ⁄ 4 2.7500 2.7500 2.7380 4 1 ⁄ 8 4.125 3.988 4.763 4.546 1 11 ⁄ 16 1.744 1.632 6.000 c 3 3.0000 3.0000 2.9880 4 1 ⁄ 2 4.500 4.350 5.196 4.959 1 7 ⁄ 8 1.935 1.815 6.500 c a Nominal Size: Where specifying nominal size in decimals, zeros preceding the decimal and in the fourth decimal place are omitted. b Thread lengths, L T , shown are for bolt lengths 6 inches and shorter. For longer bolt lengths add 0.250 inch to thread lengths shown. c Thread lengths, L T , shown are for bolt lengths over 6 inches. All dimensions are in inches. Unification: Bold type indicates product features unified dimensionally with British and Canadian Standards. Unification of fine thread products is limited to sizes 1 inch and smaller. Bearing Surface: Bearing surface is flat and washer faced. Diameter of bearing surface is equal to the maximum width across flats within a tolerance of minus 10 percent. Threads Series: Threads, when rolled, are Unified Coarse, Fine, or 8-thread series (UNRC, UNRF, or 8 UNR Series), Class 2A. Threads produced by other methods shall preferably be UNRC, UNRF or 8 UNR but, at manufacturer’s option, may be Unified Coarse, Fine or 8-thread series (UNC, UNF, or 8 UN Series), Class 2A. Material: Chemical and mechanical properties of steel screws normally conform to Grades 2, 5, or 8 of SAE J429, ASTM A449 or ASTM A354 Grade BD. Where specified, screws may also be made from brass, bronze, corrosion-resisting steel, aluminum alloy or other materials.
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