Hexagonal Heavy-series nuts used with stud bolt. Heavy hex nut dimensions in inches are covered in ASME B18.2.2 Square and Hex Nuts, however, the dimensions in matrix unit are covered in ASME B18.2.4.6M Heavy Hex Nuts. Here, I have listed the Heavy hex nut dimensions as per ISO and UNC.

heavy hex nut dimensions

ISO Heavy hex nut dimensions

ISO Nut NBAcross CornersMAX ThicknessMIN ThicknessMAX Across FlatsMIN Across Flats
M 814.386.86.441312.73
M 1017.778.48.041615.73
M 1220.0310.810.371817.73
M 1423.3512.812.12120.67
M 1626.7514.814.12423.67
M 1829.5615.815.12726.16
M 2032.951816.93029.16
M 2237.2919.418.13433
M 2439.5521.520.23635
M 2745.223.822.54140
M 3050.8526.624.34645
M 3355.3728.727.45049
M 3660.793129.45553.8
M 3966.4433.431.86058.8
M 4271.33432.46563.1
M 4576.953634.47068.1
M 4882.63839.47573.1
M 5288.254240.48078.1
M 5693.564543.48582.8
M 6099.214846.49087.8
M 64104.865149.19592.8
M 68110.515452.110097.8
M 72 x 6116.165856.1105102.8
M 76 x 6121.816159.1110107.8
M 80 x 6127.466462.1115112.8

UNC Heavy hex nut dimensions

UNC Nut N/BMax Across CornersMin Across CornersMax ThicknessMin ThicknessMax Across FlatsMax Across Flats
3/820.219.49.68.717.517
7/162221.111.210.21918.5
1/225.624.612.811.822.221.6
9/1627.526.314.413.423.823.1
5/831.229.81614.92726.2
3/436.735.119.31831.830.8
7/842.240.422.521.236.535.4
147.745.625.724.341.340
1 1/853.250.828.927.44644.6
1 1/458.656.131.830.150.849.2
1 3/864.261.43533.355.653.8
1 1/269.666.638.236.460.358.4
1 5/875.271.841.539.565.163
1 3/480.677.144.742.669.967.6
1 7/886.282.347.945.874.672.2
291.687.651.148.979.476.8
2 1/4102.698.157.254.788.986.1
2 1/2113.6108.663.66198.495.2
2 3/4124.6119.170.167.2108104.4
3135.6129.676.573.5117.5113.7
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