Machinery's Handbook, 31st Edition
1680 NUTS Table 10. American National and Unified Standard Square Nuts and Heavy Square Nuts and American National Standard Hex Thick Nuts ANSI/ASME B18.2.2-2015
Width Across Flats F
Width Across Corners G
Thickness H
Nominal Size or Basic Major Dia. of Thread
Basic
Max.
Min.
Max.
Min.
Basic
Max.
Min.
Square Nuts a ( Fig. 10)
0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 1.5000 0.2500 0.3125 0.3750 0.4375 0.5000 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 1.5000 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.8750 1.0000 1.1250 1.2500 1.3750 1.5000
0.438 0.562 0.625 0.750 0.812 1.000 1.125 1.312 1.500 1.688 1.875 2.062 2.250 0.500 0.562 0.688 0.750 0.875 1.062 1.250 1.438 1.625 1.812 2.000 2.188 2.375 0.438 0.500 0.562 0.688 0.750 0.875 0.938 1.125 1.312 1.500 1.688 1.875 2.062 2.250
0.425 0.547 0.606 0.728 0.788 0.969 1.088 1.269 1.450 1.631 1.812 1.994 2.175 0.488 0.546 0.669 0.728 0.850 1.031 1.212 1.394 1.575 1.756 1.938 2.119 2.300 0.428 0.489 0.551 0.675 0.736 0.861 0.922 1.088 1.269 1.450 1.631 1.812 1.994 2.175
0.619 0.795 0.884 1.061 1.149 1.414 1.591 1.856 2.121 2.386 2.652 2.917 3.182 0.707 0.795 0.973 1.060 1.237 1.503 1.768 2.033 2.298 2.563 2.828 3.094 3.359 0.505 0.577 0.650 0.794 0.866 1.010 1.083 1.299 1.516 1.732 1.949 2.165 2.382 2.598
0.554 0.721 0.802 0.970 1.052 1.300 1.464 1.712 1.961 2.209 2.458 2.708 2.956 0.640 0.720 0.889 0.970 1.137 1.386 1.635 1.884 2.132 2.381 2.631 2.879 3.128 0.488 0.557 0.628 0.768 0.840 0.982 1.051 1.240 1.447 1.653 1.859 2.066 2.273 2.480
0.235 0.283 0.346 0.394 0.458 0.569 0.680 0.792 0.903 1.030 1.126 1.237 1.348 0.266 0.330 0.393 0.456 0.520 0.647 0.774 0.901 1.028 1.155 1.282 1.409 1.536 0.288 0.336 0.415 0.463 0.573 0.621 0.731 0.827 0.922 1.018 1.176 1.272 1.399 1.526
0.203 0.249 0.310 0.356 0.418 0.525 0.632 0.740 0.847 0.970 1.062 1.169 1.276 0.218 0.280 0.341 0.403 0.464 0.587 0.710 0.833 0.956 1.079 1.187 1.310 1.433 0.274 0.320 0.398 0.444 0.552 0.598 0.706 0.798 0.890 0.982 1.136 1.228 1.351 1.474
1 ∕ 4
7 ∕ 16 9 ∕ 16
7 ∕ 32
5 ∕ 16
17 ∕ 64 21 ∕ 64
3 ∕ 8
5 ∕ 8 3 ∕ 4
7 ∕ 16
3 ∕ 8
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
13 ∕ 16
7 ∕ 16
1
35 ∕ 64
1 1 ∕ 8 1 5 ∕ 16 1 1 ∕ 2 1 11 ∕ 16 1 7 ∕ 8 2 1 ∕ 16 2 1 ∕ 4
21 ∕ 32 49 ∕ 64
1
7 ∕ 8
1
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
1 3 ∕ 32 1 13 ∕ 64 1 5 ∕ 16
Heavy Square Nuts a ( Fig. 10)
1 ∕ 4
1 ∕ 2
1 ∕ 4
5 ∕ 16
9 ∕ 16
5 ∕ 16
3 ∕ 8
11 ∕ 16
3 ∕ 8
7 ∕ 16
3 ∕ 4 7 ∕ 8
7 ∕ 16
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
1 ∕ 2 5 ∕ 8 3 ∕ 4 7 ∕ 8
1 1 ∕ 16 1 1 ∕ 4 1 7 ∕ 16 1 5 ∕ 8 1 13 ∕ 16 2 3 ∕ 16 2 3 ∕ 8 2
1
1
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
Hex Thick Nuts b ( Fig. 10)
1 ∕ 4
7 ∕ 16
9 ∕ 32
5 ∕ 16
1 ∕ 2
21 ∕ 64 13 ∕ 32 29 ∕ 64 39 ∕ 64 23 ∕ 32 13 ∕ 16 29 ∕ 32 9 ∕ 16
3 ∕ 8
9 ∕ 16
7 ∕ 16
11 ∕ 16
1 ∕ 2
3 ∕ 4 7 ∕ 8
9 ∕ 16
5 ∕ 8 3 ∕ 4 7 ∕ 8
15 ∕ 16 1 1 ∕ 8 1 5 ∕ 16 1 1 ∕ 2 1 11 ∕ 16 1 7 ∕ 8 2 1 ∕ 16 2 1 ∕ 4
1
1
1 1 ∕ 8 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
1 5 ∕ 32 1 1 ∕ 4 1 3 ∕ 8 1 1 ∕ 2
a Coarse-thread series, Class 2B. b Unified Coarse-, Fine-, or 8-thread series (8 UN), Class 2B. All dimensions are in inches. Bold type indicates nuts unified dimensionally with British and Canadian Standards.
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