HEX HEAVY SEMI- FINISHED NUTS
All Dimensions in inches
Nominal Size or
 Basic Major Thread Dia. 
Width Across Flats Width Across Corners Thickness
Basic Max. Min. Max. Min. Basic Max. Min.
1/4-20 0.2500 1/2 0.500 0.488 0.577 0.556 15/16 0.250 0.218
5/16-18 0.3125 9/16 0.562 0.546 0.650 0.622 19/64 0.314 0.280
3/8-16 0.3750 11/16 0.688 0.669 0.794 0.763 23/64 0.377 0.341
7/16-14 0.4375 3/4 0.750 0.728 0.866 0.830 27/64 0.441 0.403
1/2-13 0.5000 7/8 0.875 0.850 1.010 0.969 31/64 0.504 0.464
5/8-11 0.6250 1-1/16 1.062 1.031 1.227 1.175 39/64 0.631 0.587
3/4-10 0.7500 1-1/4 1.250 1.212 1.443 1.382 47/64 0.758 0.710
7/8-9 0.8750 1-7/16 1.438 1.394 1.660 1.589 55/64 0.885 0.833
1-8 1.0000 1-5/8 1.625 1.575 1.876 1.796 63/64 1.012 0.956
1-1/8-7 1.1250 1-13/16 1.812 1.756 2.093 2.002 1-7/64 1.139 1.079
1-1/8-8 1.1250 1-13/16 1.812 1.756 2.093 2.002 1-7/64 1.139 1.079
1-1/4-7 1.2500 2 2.000 1.938 2.309 2.209 1-7/32 1.251 1.187
1-1/4-8 1.2500 2 2.000 1.938 2.309 2.209 1-7/32 1.251 1.187
1-1/2-6 1.5000 2-3/8 2.375 2.300 2.742 2.622 1-15/32 1.505 1.433
1-1/2-8 1.5000 2-3/8 2.375 2.300 2.742 2.622 1-15/32 1.505 1.433
1-3/4-5 1.7500 2-3/4 2.750 2.662 3.175 3.035 1-23/32 1.759 1.679