ASME B18.2.2 Heavy Hex Nuts

ASTM A194 Grade 2H Heavy Hex Nut Dimension List - 7TMW Stock
Black Iron Hot Dipped Galvanized
Nominal Size, in. Nominal Size, mm Width Across Flats (F) (mm) Thickness (H) (mm) Nominal Size, in. Nominal Size, mm Width Across Flats (F) (mm) Thickness (H) (mm)
1⁄2 12 21.84 12.25 1⁄2 12 21.9 12.43
5⁄8 16 26.5 15.8 5⁄8 16 26.82 15.82
3⁄4 19 31.12 18.94 3⁄4 19 31.73 18.77
20 33.19 20.39 20 33.19 20.39
7⁄8 22 7⁄8 22
1 25 40.13 25.5 1 25 40.44 25.59
1 1⁄8 28 1 1⁄8 28
1 1⁄4 32 1 1⁄4 32
1 3⁄8 35 1 3⁄8 35
1 1⁄2 38 1 1⁄2 38
1 3⁄4 45 1 3⁄4 45
2 50 2 50
Standard Dimensions of Heavy Hex Nuts as required by ASTM A194 Grade 2H
Nominal Size or Basic Major Diameter of Thread Width Across Flats (F) Width Across Corners (G) Thickness (H) Nominal Size or Basic Major Diameter of Thread (mm) Width Across Flats (F) (mm) Width Across Corners (G) (mm) Thickness (H) (mm) Total Runout of Bearing Face FIM, Heavy Hex Nuts, Specified Proof Load
<150,000 psi ≥150,000 psi
1/4" 0.488 0.556 0.218 6mm 12.40 14.12 5.54 0.017 0.011
5/16" 0.546 0.622 0.280 8mm 13.87 15.80 7.77 0.020 0.012
3/8" 0.669 0.763 0.341 10mm 16.99 19.38 8.66 0.021 0.014
7/16" 0.728 0.830 0.403 11mm 18.49 21.08 10.24 0.022 0.015
1/2" 0.850 0.969 0.464 12mm 21.59 24.61 11.79 0.023 0.016
9/16" 0.909 1.037 0.526 14mm 23.09 26.34 13.36 0.024 0.017
5/8" 1.031 1.175 0.587 16mm 26.19 29.85 14.91 0.025 0.018
3/4" 1.212 1.382 0.710 19mm 30.78 35.10 18.03 0.027 0.020
20mm 33.00 37.29 19.4
7/8" 1.394 1.589 0.833 22mm 35.41 40.36 21.16 0.029 0.022
1" 1.575 1.796 0.956 25mm 40.01 45.62 24.28 0.031 0.024
1 - 1/8" 1.756 2.002 1.079 28mm 44.60 50.85 27.41 0.033 0.027
30mm 49.00 55.37 29.1
1 - 1/4" 1.938 2.209 1.187 32mm 49.23 56.11 30.15 0.035 0.030
1 - 3/8" 2.119 2.416 1.310 35mm 53.82 61.37 33.27 0.038 0.033
36mm 58.8 69.28 29.1
1 - 1/2" 2.300 2.622 1.433 38mm 58.42 66.60 36.40 0.041 0.036
40mm
1 - 5/8" 2.481 2.828 1.556 42mm 63.02 71.83 39.52 0.044 0.038
1 - 3/4" 2.662 3.035 1.679 45mm 67.61 77.09 42.65 0.048 0.041
1 - 7/8" 2.844 3.242 1.802 48mm 72.24 82.35 45.77 0.051 0.044
2" 3.025 3.449 1.925 50mm 76.84 87.60 48.90 0.055 0.047
55mm
2 - 1/4" 3.388 3.862 2.155 57mm 86.06 98.09 54.74 0.061 0.052
60mm
2 - 1/2" 3.750 4.275 2.401 65mm 95.25 108.59 60.99 0.068 0.058
2 - 3/4" 4.112 4.688 2.647 70mm 104.44 119.08 67.23 0.074 0.064
3" 4.475 5.102 2.893 75mm 113.67 129.59 73.48 0.081 0.070
3 - 1/4" 4.838 5.515 3.124 83mm 122.89 140.08 79.35 0.087 0.075
3 - 1/2" 5.200 5.928 3.370 90mm 132.08 150.57 85.60 0.094 0.081
3 - 3/4" 5.562 6.341 3.616 95mm 141.27 161.06 91.85 0.100 0.087
4" 5.925 6.755 3.862 100mm 150.50 171.58 98.09 0.107 0.093