Heavy Hex Nuts

Heavy Hex Nuts

 

Heavy hex nuts are slightly larger and thicker than standard (finished) hex nuts. There are numerous grades and the heavy pattern is typically used for large diameter and high strength bolts.

Since hot-dip galvanizing typically adds 2.2 to 5 mils of thickness to the threaded portion of a fastener, galvanized heavy hex nuts are tapped oversize to compensate for the corrosion resistant coating on the bolts.

Dimensions

Nominal Size F C H Weight Per Nut
Width Across Flats Width Across Corners Thickness
Basic Max Min Max Min Basic Max Min
1/4 1/2 0.500 0.488 0.577 0.556 15/64 0.250 0.218 0.01
5/16 9/16 0.562 0.546 0.650 0.622 19/64 0.341 0.280 0.02
3/8 11/16 0.688 0.669 0.794 0.763 23/64 0.377 0.341 0.03
1/2 7/8 0.875 0.850 1.010 0.969 31/64 0.504 0.464 0.07
5/8 1-1/16 1.062 1.031 1.227 1.175 39/64 0.631 0.587 0.12
3/4 1-1/4 1.250 1.212 1.443 1.382 47/64 0.758 0.710 0.20
7/8 1-7/16 1.438 1.394 1.660 1.589 55/64 0.885 0.833 0.30
1 1-5/8 1.625 1.575 1.876 1.796 63/64 1.012 0.956 0.43
1-1/8 1-13/16 1.812 1.756 2.093 2.002 1-7/64 1.139 1.079 0.59
1-1/4 2 2.000 1.938 2.309 2.209 1-7/32 1.251 1.187 0.79
1-3/8 2-3/16 2.188 2.119 2.526 2.416 1-11/32 1.378 1.310 1.02
1-1/2 2-3/8 2.375 2.300 2.742 2.622 1-15/32 1.505 1.433 1.31
1-5/8 2-9/16 2.562 2.481 2.959 2.828 1-19/32 1.632 1.556 1.62
1-3/4 2-3/4 2.750 2.662 3.175 3.035 1-23/32 1.759 1.679 2.04
1-7/8 2-15/16 2.938 2.844 3.392 3.242 1-27/32 1.886 1.802 2.41
2 3-1/8 3.125 3.025 3.608 3.449 1-31/32 2.013 1.925 2.99
2-1/4 3-1/2 3.500 3.388 4.041 3.862 2-13/64 2.251 2.155 4.19
2-1/2 3-7/8 3.875 3.750 4.474 4.275 2-29/64 2.505 2.401 5.64
2-3/4 4-1/4 4.250 4.112 4.907 4.688 2-45/64 2.759 2.647 7.38
3 4-5/8 4.625 4.475 5.340 5.102 2-61/64 3.013 2.893 9.50
3-1/4 5 5.000 4.838 5.774 5.515 3-3/16 3.252 3.124 11.94
3-1/2 5-3/8 5.375 5.200 6.207 5.928 3-7/16 3.506 3.370 15.26
3-3/4 5-3/4 5.750 5.562 6.640 6.341 3-11/16 3.760 3.616 18.12
4 6-1/8 6.125 5.925 7.073 6.755 3-15/16 4.014 3.862 21.80

 

 

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