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Nuts

Finished Hex Nuts

Finished Hex Jam Nuts

Dimensions of Hex Nuts and Hex Jam Nuts

Nominal Size or
Basic Major
Diameter of Thread 		F G H H1 Runout of Bearing Surface
to Thread Axis, FIM
Width Across Flats Width Across Corners Thickness Hex Nuts Thickness Jam Nuts Hex Nuts Hex Jam Nuts
Specified Proof Load
Up to
150,000
psi 		150,000
psi and
Greater 		All
Strength
Levels
Max Min Max Min Max Min Max Min Max
1/4 (0.2500) 0.438 0.428 0.505 0.488 0.226 0.212 0.163 0.150 0.015 0.010 0.015
5/16 (0.3125) 0.500 0.489 0.577 0.557 0.273 0.258 0.195 0.180 0.016 0.011 0.016
3/8 (0.3750) 0.563 0.551 0.650 0.628 0.337 0.320 0.227 0.210 0.017 0.012 0.017
7/16 (0.4375) 0.688 0.675 0.794 0.768 0.385 0.365 0.260 0.240 0.018 0.013 0.018
1/2 (0.5000) 0.750 0.736 0.866 0.840 0.448 0.427 0.323 0.302 0.019 0.014 0.019
9/16 (0.5625) 0.875 0.861 1.010 0.982 0.496 0.473 0.324 0.301 0.020 0.015 0.020
5/8 (0.6250) 0.938 0.922 1.083 1.051 0.559 0.535 0.387 0.363 0.021 0.016 0.021
3/4 (0.7500) 1.125 1.088 1.299 1.240 0.665 0.617 0.446 0.398 0.023 0.018 0.023
7/8 (0.8750) 1.312 1.269 1.516 1.447 0.776 0.724 0.510 0.458 0.025 0.020 0.025
1 (1.0000) 1.500 1.450 1.732 1.653 0.887 0.831 0.575 0.519 0.027 0.022 0.027
1-1/8 (1.1250) 1.688 1.631 1.949 1.859 0.999 0.939 0.639 0.579 0.030 0.025 0.030
1-114 (1.2500) 1.875 1.812 2.165 2.066 1.094 1.030 0.751 0.687 0.033 0.028 0.033
1-3/8 (1.3750) 2.062 1.994 2.382 2.273 1.206 1.138 0.815 0.747 0.036 0.031 0.036
1-1/2 (1.5000) 2.250 2.175 2.598 2.480 1.317 1.245 0.880 0.808 0.039 0.034 0.039
1-5/8 (1.6250) 2.43 2.35 2.805 2.679 1.416 1.364 0.944 0.868 0.044 0.038 0.044
1-3/4 (1.7500) 2.625 2.538 3.031 2.893 1.540 1.460 1.009 0.929 0.048 0.041 0.048
1-7/8 (1.8750) 2.813 2.722 3.247 3.103 1.651 1.567 1.073 0.989 0.051 0.044 0.051
2 (2.0000) 3.000 2.900 3.464 3.306 1.763 1.675 1.138 1.050 0.055 0.047 0.055
2-1/4 (2.2500) 3.375 3.263 3.897 3.719 1.986 1.890 1.267 1.155 0.061 0.052 0.061
2-1 /2 (2.5000) 3.750 3.625 4.330 4.133 2.209 2.105 1.427 1.401 0.068 0.058 0.068
2-3/4 (2.7500) 4.125 3.988 4.763 4.546 2.431 2.319 1.556 1.522 0.074 0.064 0.074
3 (3.0000) 4.500 4.350 5.196 4.959 2.654 2.534 1.685 1.643 0.081 0.070 0.081
3-1/4 (3.2500) 4.875 4.713 5.629 5.373 2.877 2.749 1.814 1.748 0.087 0.075 0.087
3-1 /2 (3.5000) 5.250 5.075 6.062 5.786 3.100 2.964 1.943 1.870 0.094 0.081 0.094
3-3/4 (3.7500) 5.625 5.438 6.495 6.199 3.322 3.178 2.072 1.990 0.100 0.087 0.100
4 (4.0000) 6.000 5.800 6.928 6.612 3.545 3.393 2.201 2.112 0.107 0.093 0.107