Machinery's Handbook, 31st Edition
1678
BOLTS, SCREWS, AND NUTS Table 8. American National Standard and Unified Standard Hex Flat Nuts and Flat Jam Nuts and Heavy Hex Flat Nuts and Flat 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, Flat Nuts H Thickness, Flat Jam Nuts H 1 Basic Max. Min. Max. Min. Basic Max. Min. Basic Max. Min. Hex Flat Nuts and Hex Flat Jam Nuts (Fig. 7) 1 1 ∕ 8 1.1250 1 11 ∕ 16 1.688 1.631 1.949 1.859 1 1.030 0.970 5 ∕ 8 0.655 0.595 1 1 ∕ 4 1.2500 1 7 ∕ 8 1.875 1.812 2.165 2.066 1 3 ∕ 32 1.126 1.062 3 ∕ 4 0.782 0.718 1 3 ∕ 8 1.3750 2 1 ∕ 16 2.062 1.994 2.382 2.273 1 13 ∕ 64 1.237 1.169 13 ∕ 16 0.846 0.778 1 1 ∕ 2 1.5000 2 1 ∕ 4 2.250 2.175 2.598 2.480 1 5 ∕ 16 1.348 1.276 7 ∕ 8 0.911 0.839 Heavy Hex Flat Nuts and Heavy Hex Flat Jam Nuts (Fig. 7) 1 1 ∕ 8 1.1250 1 13 ∕ 16 1.812 1.756 2.093 2.002 1 1 ∕ 8 1.155 1.079 5 ∕ 8 0.655 0.579 1 1 ∕ 4 1.2500 2 2.000 1.938 2.309 2.209 1 1 ∕ 4 1.282 1.187 3 ∕ 4 0.782 0.687 1 3 ∕ 8 1.3750 2 3 ∕ 16 2.188 2.119 2.526 2.416 1 3 ∕ 8 1.409 1.310 13 ∕ 16 0.846 0.747 1 1 ∕ 2 1.5000 2 3 ∕ 8 2.375 2.300 2.742 2.622 1 1 ∕ 2 1.536 1.433 7 ∕ 8 0.911 0.808 1 3 ∕ 4 1.7500 2 3 ∕ 4 2.750 2.662 3.175 3.035 1 3 ∕ 4 1.790 1.679 1 1.040 0.929 2 2.0000 3 1 ∕ 8 3.125 3.025 3.608 3.449 2 2.044 1.925 1 1 ∕ 8 1.169 1.050 2 1 ∕ 4 2.2500 3 1 ∕ 2 3.500 3.388 4.041 3.862 2 1 ∕ 4 2.298 2.155 1 1 ∕ 4 1.298 1.155 2 1 ∕ 2 2.5000 3 7 ∕ 8 3.875 3.750 4.474 4.275 2 1 ∕ 2 2.552 2.401 1 1 ∕ 2 1.552 1.401 2 3 ∕ 4 2.7500 4 1 ∕ 4 4.250 4.112 4.907 4.688 2 3 ∕ 4 2.806 2.647 1 5 ∕ 8 1.681 1.522 3 3.0000 4 5 ∕ 8 4.625 4.475 5.340 5.102 3 3.060 2.893 1 3 ∕ 4 1.810 1.643 3 1 ∕ 4 3.2500 5 5.000 4.838 5.774 5.515 3 1 ∕ 4 3.314 3.124 1 7 ∕ 8 1.939 1.748 3 1 ∕ 2 3.5000 5 3 ∕ 8 5.375 5.200 6.207 5.928 3 1 ∕ 2 3.568 3.370 2 2.068 1.870 3 3 ∕ 4 3.7500 5 3 ∕ 4 5.750 5.562 6.640 6.341 3 3 ∕ 4 3.822 3.616 2 1 ∕ 8 2.197 1.990 4 4.0000 6 1 ∕ 8 6.125 5.925 7.073 6.755 4 4.076 3.862 2 1 ∕ 4 2.326 2.112 All dimensions are in inches. Bold type indicates nuts unified dimensionally with British and Canadian Standards. Threads are Unified Coarse-thread series (UNC), Class 2B.
H 1
F
H
F
H T .016 Approx
H
G
G
S
Fig. 7. Hex Flat Nuts, Heavy Hex Flat Nuts, Hex Flat Jam Nuts, and Heavy Hex Flat Jam Nuts ( Table 8 )
Fig. 8. Hex Slotted Nuts, Heavy Hex Slotted Nuts, and Hex Thick Slotted Nuts ( Table 9 )
H
G
F
H T .016 Approx
H
F 25° Approx.
G
S
Fig. 10. Square Nuts, Heavy Square Nuts (Table 10 )
Fig. 9. Hex Thick Nuts ( Table 10 )
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