Dimensions of Hex Jam Nuts

Hex Jam Nuts                   Hex Jam Nuts    

Hex Jam Nuts
Nominal or 
Basic Major 
Diameter of Thread
F G H1
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
1/4 0.2500 7/16 0.438 0.428 0.505 0.488 5/32 0.163 0.150
5/16 0.3125 1/2 0.500 0.489 0.577 0.557 3/16 0.195 0.180
3/8 0.3750 9/16 0.562 0.551 0.650 0.628 7/32 0.227 0.210
7/16 0.4375 11/16 0.688 0.675 0.794 0.768 1/4 0.260 0.240
1/2 0.5000 3/4 0.750 0.736 0.866 0.840 5/16 0.323 0.302
9/16 0.5625 7/8 0.845 0.861 1.010 0.982 5/16 0.324 0.301
5/8 0.6250 15/16 0.938 0.922 1.083 1.051 3/8 0.387 0.363
3/4 0.7500 1-1/8 1.125 1.088 1.299 1.240 27/64 0.880 0.808
7/8 0.8750 1-5/16 1.312 1.269 1.516 1.447 31/64 0.510 0.458
1" 1.0000 1-1/2 1.500 1.450 1.732 1.653 35/64 0.575 0.519
1-1/8 1.1250 1-11/16 1.688 1.631 1.949 1.859 39/64 0.639 0.579
1-1/4 1.2500 1-7/8 1.875 1.812 2.165 2.066 23/32 0.751 0.687
1-3/8 1.3750 2-1/16 2.062 1.994 2.382 2.273 25/32 0.815 0.747
1-1/2 1.5000 2-1/4 2.250 2.175 2.598 2.480 27/32 0.880 0.808
1-3/4 1.7500 2-5/8 2.625 2.538 3.031 2.893 31/32 1.009 0.929
2" 2.0000 3" 3.000 2.900 3.464 3.306 1-3/32 1.138 1.050