BOLTS AND NUTS 1493 An externally threaded fastener that must be assembled with a nut to perform its intended service is a bolt. (Example: heavy hex structural bolt.) An externally threaded fastener that must be torqued by its head into a tapped or other preformed hole to perform its intended service is a screw. (Example: square head set screw.) Square Bolts( Table 1 ) Heavy Hex Structural Bolts ( Table 2 ) Hex Nuts ( Table 7 ) Heavy Hex Nuts (Table 7) Hex Bolts, Heavy Hex Bolts (Table 3 ) Hex Jam Nuts (Table 7) Heavy Hex Jam Nuts (Table 7) Hex Cap Screws, Heavy Hex Screws (Table 4) Square and Hex Bolts, Screws, and Nuts. The dimensions for square and hex bolts and screws given in the following tables have been taken from American National Standard ANSI/ASME B18.2.1-1996 and for nuts from American National Standard ANSI/ASME B18.2.2-1987 (R1999) Reference should be made to these Standards for information or data not found in the following text and tables: Designation: Bolts and screws should be designated by the following data in the sequence shown: nominal size (fractional and decimal equivalent); threads per inch (omit for lag screws); product length for bolts and screws (fractional or two-place decimal equivalent); product name; material, including specification, where necessary; and protective
BOLTS AND NUTS 1495 Table 3. American National Standard and Unified Standard Hex and Heavy Hex Bolts ANSI/ASME B18.2.1-1996 Size a or Basic Full Size Body Dia.E Flats F Corners G Head Height H Thread Length b L T Dia. Basic Min. Min. Basic Min. Nom. HEX BOLTS 1 4 0.2500 0.260 7 16 0.438 0.425 0.505 0.484 11 64 0.188 0.150 0.750 5 16 0.3125 0.324 1 2 0.500 0.484 0.577 0.552 7 32 0.235 0.195 0.875 3 8 0.3750 0.388 9 16 0.562 0.544 0.650 0.620 1 4 0.268 0.226 1.000 7 16 0.4375 0.452 5 8 0.625 0.603 0.722 0.687 19 64 0.316 0.272 1.125 1 2 0.5000 0.515 3 4 0.750 0.725 0.866 0.826 11 32 0.364 0.302 1.250 5 8 0.6250 0.642 15 16 0.938 0.906 1.083 1.033 27 64 0.444 0.378 1.500 3 4 0.7500 0.768 1 1 8 1.125 1.088 1.299 1.240 1 2 0.524 0.455 1.750 7 8 0.8750 0.895 1 5 16 1.312 1.269 1.516 1.447 37 64 0.604 0.531 2.000 1 1.0000 1.022 1 1 2 1.500 1.450 1.732 1.653 43 64 0.700 0.591 2.250 1 1 8 1.1250 1.149 1 11 16 1.688 1.631 1.949 1.859 3 4 0.780 0.658 2.500 1 1 4 1.2500 1.277 1 7 8 1.875 1.812 2.165 2.066 27 32 0.876 0.749 2.750 1 3 8 1.3750 1.404 2 1 16 2.062 1.994 2.382 2.273 29 32 0.940 0.810 3.000 1 1 2 1.5000 1.531 2 1 4 2.250 2.175 2.598 2.480 1 1.036 0.902 3.250 1 3 4 1.7500 1.785 2 5 8 2.625 2.538 3.031 2.893 1 5 32 1.196 1.054 3.750 2 2.000 2.039 3 3.000 2.900 3.464 3.306 1 11 32 1.388 1.175 4.250 2 1 4 2.2500 2.305 3 3 8 3.375 3.262 3.897 3.719 1 1 2 1.548 1.327 4.750 2 1 2 2.5000 2.559 3 3 4 3.750 3.625 4.330 4.133 1 21 32 1.708 1.479 5.250 2 3 4 2.7500 2.827 4 1 8 4.125 3.988 4.763 4.546 1 13 16 1.869 1.632 5.750 3 3.0000 3.081 4 1 2 4.500 4.350 5.196 4.959 2 2.060 1.815 6.250 3 1 4 3.2500 3.335 4 7 8 4.875 4.712 5.629 5.372 2 3 16 2.251 1.936 6.750 3 1 2 3.5000 3.589 5 1 4 5.250 5.075 6.062 5.786 2 5 16 2.380 2.057 7.250 3 3 4 3.7500 3.858 5 5 8 5.625 5.437 6.495 6.198 2 1 2 2.572 2.241 7.750 4 4.0000 4.111 6 6.000 5.800 6.928 6.612 2 11 16 2.764 2.424 8.250 HEAVY HEX BOLTS 1 2 0.5000 0.515 7 8 0.875 0.850 1.010 0.969 11 32 0.364 0.302 1.250 5 8 0.6250 0.642 1 1 16 1.062 1.031 1.227 1.175 27 64 0.444 0.378 1.500 3 4 0.7500 0.768 1 1 4 1.250 1.212 1.443 1.383 1 2 0.524 0.455 1.750 7 8 0.8750 0.895 1 7 16 1.438 1.394 1.660 1.589 37 64 0.604 0.531 2.000 1 1.0000 1.022 1 5 8 1.625 1.575 1.876 1.796 43 64 0.700 0.591 2.250 1 1 8 1.1250 1.149 1 13 16 1.812 1.756 2.093 2.002 3 4 0.780 0.658 2.500 1 1 4 1.2500 1.277 2 2.000 1.938 2.309 2.209 27 32 0.876 0.749 2.750 1 3 8 1.3750 1.404 2 3 16 2.188 2.119 2.526 2.416 29 32 0.940 0.810 3.000 1 1 2 1.5000 1.531 2 3 8 23.75 2.300 2.742 2.622 1 1.036 0.902 3.250 1 3 4 1.7500 1.785 2 3 4 2.750 2.662 3.175 3.035 1 5 32 1.196 1.054 3.750 2 2.0000 2.039 3 1 8 3.125 3.025 3.608 3.449 1 11 32 1.388 1.175 4.250 2 1 4 2.2500 2.305 3 1 2 3.500 3.388 4.041 3.862 1 1 2 1.548 1.327 4.750 2 1 2 2.5000 2.559 3 7 8 3.875 3.750 4.474 4.275 1 21 32 1.708 1.479 5.250 2 3 4 2.7500 2.827 4 1 4 4.250 4.112 4.907 4.688 1 13 16 1.869 1.632 5.750 3 3.0000 3.081 4 5 8 4.625 4.475 5.340 5.102 2 2.060 1.815 6.250 a Size: Where specifying nominal size in decimals, zeros preceding the decimal point 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. Bold type shows bolts unified dimensionally with British and Canadian Standards. Threads: Threads, when rolled, are Unified Coarse, Fine, or 8-thread series (UNRC, UNRF, or 8 UNR Series), Class 2A. Threads produced by other methods may be Unified Coarse, Fine or 8-thread series (UNC, UNF, or 8 UN Series), Class 2A. Body Diameter: Bolts may be obtained in reduced diameter body. Where reduced diameter body is specified, the body diameter may be reduced to approximately the pitch diameter of the thread. A shoulder of full body diameter under the head may be supplied at the option of the manufacturer. Material: Unless otherwise specified, chemical and mechanical properties of steel bolts conform to ASTM A307, Grade A. Other materials are as agreed upon by manufacturer and purchaser.
BOLTS AND NUTS 1499 Table 7. American National Standard and Unified Standard Hex Nuts and Jam Nuts and Heavy Hex Nuts and Jam ANSI/ASME B18.2.2-1987 (R1999) Size or Basic Major Dia. of Thread Flats F Corners G Thickness, Nuts H Thickness,Jam Nuts H 1 Basic Min. Min. Basic Min. Basic Min. Hex Nuts and Hex Jam Nuts 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 and Heavy Hex Jam Nuts 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 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.
1512 WASHERS Table 1a. American National Standard Type A Plain Washers Preferred Sizes ANSI/ASME B18.22.1-1965 (R1998) Inside Diameter Outside Diameter Thickness Washer Tolerance Tolerance Size a Series Basic Plus Minus Basic Plus Minus Basic Min. 0.078 0.000 0.005 0.188 0.000 0.005 0.020 0.025 0.016 0.094 0.000 0.005 0.250 0.000 0.005 0.020 0.025 0.016 0.125 0.008 0.005 0.312 0.008 0.005 0.032 0.040 0.025 No. 6 0.138 0.156 0.008 0.005 0.375 0.015 0.005 0.049 0.065 0.036 No. 8 0.164 0.188 0.008 0.005 0.438 0.015 0.005 0.049 0.065 0.036 No. 10 0.190 0.219 0.008 0.005 0.500 0.015 0.005 0.049 0.065 0.036 3 16 0.188 0.250 0.015 0.005 0.562 0.015 0.005 0.049 0.065 0.036 No. 12 0.216 0.250 0.015 0.005 0.562 0.015 0.005 0.065 0.080 0.051 1 4 0.250 N 0.281 0.015 0.005 0.625 0.015 0.005 0.065 0.080 0.051 1 4 0.250 W 0.312 0.015 0.005 0.734 b 0.015 0.007 0.065 0.080 0.051 5 16 0.312 N 0.344 0.015 0.005 0.688 0.015 0.007 0.065 0.080 0.051 5 16 0.312 W 0.375 0.015 0.005 0.875 0.030 0.007 0.083 0.104 0.064 3 8 0.375 N 0.406 0.015 0.005 0.812 0.015 0.007 0.065 0.080 0.051 3 8 0.375 W 0.438 0.015 0.005 1.000 0.030 0.007 0.083 0.104 0.064 7 16 0.438 N 0.469 0.015 0.005 0.922 0.015 0.007 0.065 0.080 0.051 7 16 0.438 W 0.500 0.015 0.005 1.250 0.030 0.007 0.083 0.104 0.064 1 2 0.500 N 0.531 0.015 0.005 1.062 0.030 0.007 0.095 0.121 0.074 1 2 0.500 W 0.562 0.015 0.005 1.375 0.030 0.007 0.109 0.132 0.086 9 16 0.562 N 0.594 0.015 0.005 1.156 b 0.030 0.007 0.095 0.121 0.074 9 16 0.562 W 0.625 0.015 0.005 1.469 b 0.030 0.007 0.109 0.132 0.086 5 8 0.625 N 0.656 0.030 0.007 1.312 0.030 0.007 0.095 0.121 0.074 5 8 0.625 W 0.688 0.030 0.007 1.750 0.030 0.007 0.134 0.160 0.108 3 4 0.750 N 0.812 0.030 0.007 1.469 0.030 0.007 0.134 0.160 0.108 3 4 0.750 W 0.812 0.030 0.007 2.000 0.030 0.007 0.148 0.177 0.122 7 8 0.875 N 0.938 0.030 0.007 1.750 0.030 0.007 0.134 0.160 0.108 7 8 0.875 W 0.938 0.030 0.007 2.250 0.030 0.007 0.165 0.192 0.136 1 1.000 N 1.062 0.030 0.007 2.000 0.030 0.007 0.134 0.160 0.108 1 1.000 W 1.062 0.030 0.007 2.500 0.030 0.007 0.165 0.192 0.136 1 1 8 1.125 N 1.250 0.030 0.007 2.250 0.030 0.007 0.134 0.160 0.108 1 1 8 1.125 W 1.250 0.030 0.007 2.750 0.030 0.007 0.165 0.192 0.136 1 1 4 1.250 N 1.375 0.030 0.007 2.500 0.030 0.007 0.165 0.192 0.136 1 1 4 1.250 W 1.375 0.030 0.007 3.000 0.030 0.007 0.165 0.192 0.136 1 3 8 1.375 N 1.500 0.030 0.007 2.750 0.030 0.007 0.165 0.192 0.136 1 3 8 1.375 W 1.500 0.045 0.010 3.250 0.045 0.010 0.180 0.213 0.153 1 1 2 1.500 N 1.625 0.030 0.007 3.000 0.030 0.007 0.165 0.192 0.136 1 1 2 1.500 W 1.625 0.045 0.010 3.500 0.045 0.010 0.180 0.213 0.153 1 5 8 1.625 1.750 0.045 0.010 3.750 0.045 0.010 0.180 0.213 0.153 1 3 4 1.750 1.875 0.045 0.010 4.000 0.045 0.010 0.180 0.213 0.153 1 7 8 1.875 2.000 0.045 0.010 4.250 0.045 0.010 0.180 0.213 0.153 2 2.000 2.125 0.045 0.010 4.500 0.045 0.010 0.180 0.213 0.153 2 1 4 2.250 2.375 0.045 0.010 4.750 0.045 0.010 0.220 0.248 0.193 2 1 2 2.500 2.625 0.045 0.010 5.000 0.045 0.010 0.238 0.280 0.210 2 3 4 2.750 2.875 0.065 0.010 5.250 0.065 0.010 0.259 0.310 0.228 3 3.000 3.125 0.065 0.010 5.500 0.065 0.010 0.284 0.327 0.249 a washer sizes are intended for use with comparable nominal screw or bolt sizes. b The 0.734-inch, 1.156-inch, and 1.469-inch outside diameters avoid washers which could be used in coin operated devices. Preferred sizes are for the most part from series previously designated Standard Plate and SAE. Where common sizes existed in the two series, the SAE size is designated N (narrow) and the Standard Plate W (wide). These sizes as well as all other sizes of Type A Plain Washers are to be ordered by ID, OD, and thickness dimensions. Additional selected sizes of Type A Plain Washers are shown in Table 1b.
Table 2. American National Standard Helical Spring Lock Washers ANSI/ASME B18.21.1-1994 Washer Size Inside Diameter, A Regular Heavy Extra Duty Min. O.D., B O.D.,B O.D., B a T = mean section thickness = (t i + t o ) 2. No. 2 0.086 0.094 0.088 0.172 0.035 0.020 0.182 0.040 0.025 0.208 0.053 0.027 No. 3 0.099 0.107 0.101 0.195 0.040 0.025 0.209 0.047 0.031 0.239 0.062 0.034 No. 4 0.112 0.120 0.114 0.209 0.040 0.025 0.223 0.047 0.031 0.253 0.062 0.034 No. 5 0.125 0.133 0.127 0.236 0.047 0.031 0.252 0.055 0.040 0.300 0.079 0.045 No. 6 0.138 0.148 0.141 0.250 0.047 0.031 0.266 0.055 0.040 0.314 0.079 0.045 No. 8 0.164 0.174 0.167 0.293 0.055 0.040 0.307 0.062 0.047 0.375 0.096 0.057 No. 10 0.190 0.200 0.193 0.334 0.062 0.047 0.350 0.070 0.056 0.434 0.112 0.068 No. 12 0.216 0.227 0.220 0.377 0.070 0.056 0.391 0.077 0.063 0.497 0.130 0.080 1 4 0.250 0.060 0.252 0.487 0.109 0.062 0.489 0.110 0.077 0.533 0.132 0.084 5 16 0.3125 0.322 0.314 0.583 0.125 0.078 0.293 0.130 0.097 0.619 0.143 0.108 3 8 0.375 0.385 0.377 0.680 0.141 0.094 0.688 0.145 0.115 0.738 0.170 0.123 7 16 0.4375 0.450 0.440 0.776 0.156 0.109 0.784 0.160 0.133 0.836 0.186 0.143 1 2 0.500 0.512 0.502 0.869 0.171 0.125 0.879 0.176 0.151 0.935 0.204 0.162 9 16 0.5625 0.574 0.564 0.965 0.188 0.141 0.975 0.193 0.170 1.035 0.223 0.182 5 8 0.625 0.641 0.628 1.073 0.203 0.156 1.087 0.210 0.189 1.151 0.242 0.202 11 16 0.6875 0.704 0.691 1.170 0.219 0.172 1.186 0.227 0.207 1.252 0.260 0.221 3 4 0.750 0.766 0.753 1.265 0.234 0.188 1.285 0.244 0.226 1.355 0.279 0.241 13 16 0.8125 0.832 0.816 1.363 0.250 0.203 1.387 0.262 0.246 1.458 0.298 0.261 7 8 0.875 0.894 0.878 1.459 0.266 0.219 1.489 0.281 0.266 1.571 0.322 0.285 15 16 0.9375 0.958 0.941 1.556 0.281 0.234 1.590 0.298 0.284 1.684 0.345 0.308 1 1.000 1.024 1.003 1.656 0.297 0.250 1.700 0.319 0.306 1.794 0.366 0.330 1 1 16 1.0625 1.087 1.066 1.751 0.312 0.266 1.803 0.338 0.326 1.905 0.389 0.352 1 1 8 1.125 1.153 1.129 1.847 0.328 0.281 1.903 0.356 0.345 2.013 0.411 0.375 1 3 16 1.1875 1.217 1.192 1.943 0.344 0.297 2.001 0.373 0.364 2.107 0.431 0.396 1 1 4 1.250 1.280 1.254 2.036 0.359 0.312 2.104 0.393 0.384 2.222 0.452 0.417 1 5 16 1.3125 1.344 1.317 2.133 0.375 0.328 2.203 0.410 0.403 2.327 0.472 0.438 1 3 8 1.375 1.408 1.379 2.219 0.391 0.344 2.301 0.427 0.422 2.429 0.491 0.458 1 7 16 1.4375 1.472 1.442 2.324 0.406 0.359 2.396 0.442 0.440 2.530 0.509 0.478 1 1 2 1.500 1.534 1.504 2.419 0.422 0.375 2.491 0.458 0.458 2.627 0.526 0.496 LOCK WASHERS 1517