Machinery's Handbook, 31st Edition
1672 BOLTS, SCREWS, AND NUTS Screw, SAE Grade 8 Steel; and (3) .75 × 5.00 Hex Lag Screw, Steel. (4) 1 ∕ 4 -16 Heavy Hex Nut, SAE J995 Grade 5 Steel; and (6) 1000-8 Hex Thick Slotted Nut, ASTM F594 (Alloy Group 1) Corrosion-Resistant Steel. Table 1. American National Standard and Unified Standard Square Bolts ANSI/ASME B18.2.1-2012 SQUARE BOLTS ( Fig. 1) Nominal 2 -13 Square Nut, Steel, Zinc Plated; (5) 3 ∕
Body Dia. b E
Width Across Flats F
Width Across Corners G
Thread Length c L T
Head Height H
Size a or Basic Product Dia.
Max. 0.260 0.324 0.388 0.452 0.515 0.642 0.768 0.895 1.022 1.149 1.277 1.404
Basic Max.
Min.
Max.
Min.
Basic
Max.
Min.
Nom. 0.750 0.875 1.000 1.125 1.250 1.500 1.750 2.000 2.250 2.500 2.750 3.000
0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750
0.375 0.362 0.530 0.498 0.500 0.484 0.707 0.665 0.562 0.544 0.795 0.747 0.625 0.603 0.884 0.828 0.750 0.725 1.061 0.995 0.938 0.906 1.326 1.244 1.125 1.088 1.591 1.494 1.312 1.269 1.856 1.742 1.500 1.450 2.121 1.991
0.188 0.156 0.220 0.186 0.268 0.232 0.316 0.278 0.348 0.308 0.444 0.400 0.524 0.476 0.620 0.568 0.684 0.628 0.780 0.720 0.876 0.812 0.940 0.872
1 ∕ 4
3 ∕ 8 1 ∕ 2
11 ∕ 64 13 ∕ 64
5 ∕ 16
3 ∕ 8
9 ∕ 16
1 ∕ 4
7 ∕ 16
5 ∕ 8 3 ∕ 4
19 ∕ 64 21 ∕ 64 27 ∕ 64
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
15 ∕ 16
1 1 ∕ 8
1 ∕ 2
1 5 ∕ 16
19 ∕ 32 21 ∕ 32
1
1 1 ∕ 2
1 11 ∕ 16 1.688 1.631 2.386 2.239
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
3 ∕ 4
1.875 1.812 2.652 2.489 2.602 1.994 2.917 2.738
1 7 ∕ 8
27 ∕ 32 29 ∕ 32
2 1 ∕ 16
1.5000 3.250 a Where specifying nominal size in decimals, zeros before the decimal point and in the fourth decimal place are omitted. b See Body Diameter footnote in Table 3. c 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. Table 2. American National Standard Heavy Hex Structural Bolts ANSI/ASME B18.2.1-1981 (R1992) a HEAVY HEX STRUCTURAL BOLTS (Fig. 2) 1.531 2 1 ∕ 4 2.250 2.175 3.182 2.986 1 1.036 0.964
Thread Length L T
Trans. Thread Y
Radius of Fillet R
Body Dia. E
Width Across Flats F
Width Across Corners G
Height H
Nominal Size a or Basic Product Dia.
Max. Min. Max. Min. Max. Min. Max. Min. Max. Min.
Basic Max.
1 ∕ 2 0.5000 0.515 0.482 0.875 0.850 1.010 0.969 0.323 0.302 0.031 0.009 1.00 0.19 5 ∕ 8 0.6250 0.642 0.605 1.062 1.031 1.227 1.175 0.403 0.378 0.062 0.021 1.25 0.22 3 ∕ 4 0.7500 0.768 0.729 1.250 1.212 1.443 1.383 0.483 0.455 0.062 0.021 1.38 0.25 7 ∕ 8 0.8750 0.895 0.852 1.438 1.394 1.660 1.589 0.563 0.531 0.062 0.031 1.50 0.28 1 1.0000 1.022 0.976 1.625 1.575 1.876 1.796 0.627 0.591 0.093 0.062 1.75 0.31 1 1 ∕ 8 1.1250 1.149 1.098 1.812 1.756 2.093 2.002 0.718 0.658 0.093 0.062 2.00 0.34 1 1 ∕ 4 1.2500 1.277 1.223 2.000 1.938 2.309 2.209 0.813 0.749 0.093 0.062 2.00 0.38 1 3 ∕ 8 1.3750 1.404 1.345 2.188 2.119 2.526 2.416 0.878 0.810 0.093 0.062 2.25 0.44 1 1 ∕ 2 1.5000 1.531 1.470 2.375 2.300 2.742 2.622 0.974 0.902 0.093 0.062 2.25 0.44 a The table has been included for reference only. Heavy hex structural bolts have been removed from ANSI/ASME B18.2.1 and are now included in ANSI/ASME B18.2.6. All dimensions are in inches. Bold type shows bolts unified dimensionally with British and Canadian Standards. Threads, when rolled, shall be 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.
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