Heavy Hex Nuts Specification | Heavy Hex Nuts - Heavy Hex Nuts Techinical Information | Heavy Hex Nuts Dimensions
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Heavy hex nut

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 Heavy hex nuttypically used for large diameter and high strength bolts. See our nut compatibility chart to determine the compatible heavy hex nut(s) for a specific grade of bolt. 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.

Stock

Diameters: 3/8" - 2-3/4"
Origin: Domestic and import
Finish: Black and hot-dip galvanized
Grades: A563 (grades A, C, and DH), A194 grade 2H

Nominal Size F C H Weight
Per Nut
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 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

Dimensions per ASME B18.2.2

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