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Heavy Hex Nuts

Heavy Hex Nuts

Heavy hex nuts are used when more “beef” is needed than in standard hex nuts. Often heavy hex nuts are used in high temperature and high pressure applications, particularly those involving flanged joints. Generally the width across the flats is 1/8 of an inch larger than common hex nuts. The thickness of heavy hex nuts is equal to approximately the nominal diameter, which is about 10% thicker than a regular hex nut.

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Specifications & Technical Data

Dimensions

Nominal Size Basic Major Diameter of Thread F G H Maximum Runout of Bearing Surface to Thread Axis, FIM (Specified Proof Load)
Width Across Flats Width Across Corners Thickness Heavy Hex Nuts
Basic Min Max Min Max Basic Min Max Up to 150,000 psi 150,000 psi and Greater
1/4 0.2500 1/2 0.488 0.500 0.556 0.577 15/64 0.218 0.250 0.017 0.011
5/16 0.3125 9/16 0.546 0.562 0.622 0.650 19/64 0.280 0.314 0.020 0.012
3/8 0.3750 11/16 0.669 0.688 0.763 0.794 23/64 0.341 0.377 0.021 0.014
7/16 0.4375 3/4 0.728 0.750 0.830 0.866 27/64 0.403 0.441 0.022 0.015
1/2 0.5000 7/8 0.850 0.875 0.969 1.010 31/64 0.464 0.504 0.023 0.016
9/16 0.5625 15/16 0.909 0.938 1.037 1.083 35/64 0.526 0.568 0.024 0.017
5/8 0.6250 1-1/16 1.031 1.062 1.175 1.227 39/64 0.587 0.631 0.025 0.018
3/4 0.7500 1-1/4 1.212 1.250 1.382 1.443 47/64 0.710 0.758 0.027 0.020
7/8 0.8750 1-7/16 1.394 1.438 1.589 1.660 55/64 0.833 0.885 0.029 0.022
1 1.0000 1-5/8 1.575 1.625 1.796 1.876 63/64 0.956 1.012 0.031 0.024
1-1/8 1.1250 1-13/16 1.756 1.812 2.002 2.093 1-7/64 1.079 1.139 0.033 0.027
1-1/4 1.2500 2 1.938 2.000 2.209 2.309 1-7/32 1.187 1.251 0.035 0.030
1-3/8 1.3750 2-3/16 2.119 2.188 2.416 2.526 1-11/32 1.310 1.378 0.038 0.033
1-1/2 1.5000 2-3/8 2.300 2.375 2.622 2.742 1-15/32 1.433 1.505 0.041 0.036
1-5/8 1.6250 2-9/16 2.481 2.562 2.828 2.959 1-19/32 1.556 1.632 0.044 0.038
1-3/4 1.7500 2-3/4 2.662 2.750 3.035 3.175 1-23/32 1.679 1.759 0.048 0.041
1-7/8 1.8750 2-15/16 2.844 2.938 3.242 3.392 1-27/32 1.802 1.886 0.051 0.044
2 2.0000 3-1/8 3.025 3.125 3.449 3.608 1-31/32 1.925 2.013 0.055 0.047
2-1/4 2.2500 3-1/2 3.388 3.500 3.862 4.041 2-13/64 2.155 2.251 0.061 0.052
2-1/2 2.5000 3-7/8 3.750 3.875 4.275 4.474 2-29/64 2.401 2.505 0.068 0.058
2-3/4 2.7500 4-1/4 4.112 4.250 4.688 4.907 2-45/64 2.647 2.759 0.074 0.064
3 3.0000 4-5/8 4.475 4.625 5.102 5.340 2-61/64 2.893 3.013 0.081 0.070
3-1/4 3.2500 5 4.838 5.000 5.515 5.774 3-3/16 3.124 3.252 0.087 0.075
3-1/2 3.5000 5-3/8 5.200 5.375 5.928 6.207 3-7/16 3.370 3.506 0.094 0.081
3-3/4 3.7500 5-3/4 5.562 5.750 6.341 6.640 3-11/16 3.616 3.760 0.100 0.087
4 4.000 6-1/8 5.925 6.125 6.755 7.073 3-15/16 3.862 4.014 0.107 0.093

Finished Hex Nut Specifications

  • STANDARD (ASME/ANSI)
    • ASME B18.2.2 – 2012
  • METRIC (IFI)
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Industries We Serve

Nickel Systems provides high quality exotic grade materials that hold up in the toughest, most severe heat and corrosive environments. With our large inventory of specialty fasteners in stock, we are always ready to answer the call to serve the most challenging applications.

Nickel Systems can supply heavy hex nuts conforming to: ASTM A194 2H (1045 Steel, Heat-Treated), ASTM A194 Grade 6 (410 Stainless), ASTM A194 Grade 8 (304 Stainless), ASTM A194 Grade 8C (347 Stainless), ASTM A194 Grade 8M (316 Stainless), A194 Grade 8R (Nitronic® 50), A194 Grade 8S (Nitronic® 60) and A194 Grade 8T (321 Stainless).

Nickel Systems is not limited to materials covered by ASTM A194. We maintain heavy hex nut inventory in Hastelloy® C (Alloy C276), Carpenter® 20 (Alloy 20) and Duplex 2205. Metric sizes and other alloys can be provided.

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