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Nuts

Grade C Lock Nuts

Dimensions of Prevailing-Torque Type Regular Hex and Light Hex Series Nuts

Nominal Size or Basic Major Dia of Thread Width Across Flats Width Across Corners Thickness Height of Hex Dia of Bearing Surface Angularity of Bearing Surface FIM
Regular Series Light Series Regular Series Light Series Top Insert Type All Metal Type Both Types Regular Series Light Series
F F G G H H H J K K M
Basic Max Min Basic Max Min Max Min Max Min Max Max Min Min Max Min Max Min Max
No.4 0.1120 1/4 0.251 0.241 1/4 0.251 0.241 0.289 0.275 0.289 0.275 0.163 0.163 0.087 0.066 0.251 0.238 0.251 0.238 0.008
6 0.1380 5/16 0.313 0.302 5/16 0.313 0.302 0.361 0.344 0.361 0.344 0.188 0.171 0.102 0.075 0.313 0.297 0.313 0.297 0.008
8 0.1640 11/32 0.345 0.332 11/32 0.345 0.332 0.397 0.378 0.397 0.378 0.239 0.191 0.117 0.083 0.345 0.328 0.345 0.328 0.009
10 0.1900 3/8 0.376 0.362 3/8 0.376 0.362 0.433 0.413 0.433 0.413 0.249 0.241 0.117 0.083 0.376 0.357 0.376 0.357 0.009
12 0.2160 7/16 0.438 0.423 7/16 0.438 0.423 0.505 0.482 0.505 0.482 0.328 0.241 0.148 0.103 0.438 0.416 0.438 0.416 0.010
1/4 0.2500 7/16 0.4385 0.428 7/16 0.4385 0.428 0.505 0.488 0.505 0.488 0.328 0.288 0.212 0.145 0.438 0.416 0.438 0.416 0.010
5/16 0.3125 1/2 0.5020 0.489 1/2 0.5020 0.489 0.577 0.557 0.577 0.557 0.359 0.336 0.258 0.166 0.502 0.475 0.502 0.475 0.011
3/8 0.3750 9/16 0.5645 0.551 9/16 0.5645 0.551 0.650 0.628 0.650 0.628 0.469 0.415 0.320 0.198 0.564 0.534 0.564 0.534 0.012
7/16 0.4375 11/16 0.6895 0.675 11/16 0.6895 0.675 0.794 0.768 0.794 0.768 0.524 0.463 0.365 0.223 0.689 0.653 0.689 0.653 0.013
1/2 0.5000 3/4 0.7520 0.736 3/4 0.7520 0.736 0.866 0.840 0.866 0.840 0.609 0.573 0.427 0.262 0.752 0.712 0.752 0.712 0.014
9/16 0.5625 7/8 0.8770 0.861 7/8 0.8770 0.861 1.010 0.982 1.010 0.982 0.656 0.621 0.473 0.286 0.877 0.830 0.877 0.830 0.015
5/8 0.6250 15/16 0.9395 0.922 15/16 0.9395 0.922 1.083 1.051 1.083 1.051 0.765 0.731 0.535 0.329 0.939 0.890 0.939 0.890 0.016
3/4 0.7500 1-1/8 1.1270 1.088 1-1/16 1.064 1.052 1.299 1.240 1.227 1.191 0.890 0.827 0.617 0.382 1.127 1.069 1.064 1.033 0.018
7/8 0.8750 1-5/16 1.3145 1.269 1-1/4 1.252 1.239 1.516 1.447 1.443 1.403 0.999 0.922 0.724 0.450 1.314 1.246 1.252 1.230 0.020
1 1.0000 1-1/2 1.5020 1.450 1-7/16 1.440 1.427 1.732 1.653 1.660 1.619 1.124 1.018 0.831 0.513 1.502 1.425 1.440 1.418 0.022
1-1/8 1.1250 1-11/16 1.6895 1.631 1-5/8 1.627 1.614 1.949 1.859 1.876 1.833 1.281 1.176 0.939 0.576 1.689 1.603 1.627 1.605 0.025
1-1/4 1.2500 1-7/8 1.8770 1.812 1-13/16 1.815 1.801 2.165 2.066 2.093 2.046 1.422 1.272 1.030 0.628 1.877 1.781 1.815 1.793 0.028
1-3/8 1.3750 2-1/16 2.0645 1.994 2 2.008 1.973 2.382 2.273 2.309 2.259 1.609 1.399 1.138 0.681 2.064 1.959 2.008 1.962 0.031
1-1/2 1.5000 2-1/4 2.2520 2.175 2-3/16 2.197 2.159 2.598 2.480 2.526 2.473 1.671 1.526 1.245 0.757 2.252 2.138 2.197 2.148 0.034