Heavy Hex Jam Nuts

Heavy Hex Jam Nuts

 

Heavy hex jam nuts are thinner than a standard heavy hex nut but have the same dimension across the flats and corners. Heavy hex jam nuts have two common applications. A heavy hex jam nut can be threaded onto a bolt and run tight against the standard heavy hex nut which will lock the nut in place and prevent it from backing off. Heavy hex jam nuts are sometimes used for leveling purposes as well. Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized heavy hex jam nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.

Dimensions

Nominal Size F C H
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
3/8 11/16 0.688 0.669 0.794 0.763 15/64 0.252 0.216
1/2 7/8 0.875 0.850 1.010 0.969 19/64 0.317 0.277
5/8 1-1/16 1.062 1.031 1.227 1.175 23/64 0.381 0.337
3/4 1-1/4 1.250 1.212 1.443 1.382 27/64 0.446 0.398
7/8 1-7/16 1.438 1.394 1.660 1.589 31/64 0.510 0.458
1 1-5/8 1.625 1.575 1.876 1.796 35/64 0.575 0.519
1-1/8 1-13/16 1.812 1.756 2.093 2.002 39/64 0.639 0.579
1-1/4 2 2.000 1.938 2.309 2.209 23/32 0.751 0.687
1-3/8 2-13/16 2.188 2.119 2.526 2.416 25/32 0.815 0.747
1-1/2 2-3/8 2.375 2.300 2.742 2.622 27/32 0.880 0.808
1-5/8 2-9/16 2.562 2.481 2.959 2.828 29/32 0.944 0.868
1-3/4 2-3/4 2.750 2.662 3.175 3.035 31/32 1.009 0.929
1-7/8 2-15/16 2.938 2.844 3.392 3.242 1-1/32 1.073 0.989
2 3-1/8 3.125 3.025 3.608 3.449 1-3/32 1.138 1.050
2-1/4 3-1/2 3.500 3.388 4.041 3.862 1-13/64 1.251 1.155
2-1/2 3-7/8 3.875 3.750 4.474 4.275 1-29/64 1.505 1.401
2-3/4 4-1/4 4.250 4.112 4.907 4.688 1-37/64 1.634 1.522
3 4-5/8 4.625 4.475 5.340 5.102 1-45/64 1.763 1.643
3-1/4 5 5.000 4.838 5.774 5.515 1-13/16 1.876 1.748
3-1/2 5-3/8 5.375 5.200 6.207 5.928 1-15/16 2.006 1.870
3-3/4 5-3/4 5.750 5.562 6.640 6.341 2-1/16 2.134 1.990
4 6-1/8 6.125 5.925 7.073 6.755 2-3/16 2.264 2.112

 

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