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ASME B18.2.2 Heavy Hex Nuts

ASME B18.2.2 Heavy Hex Nuts

ASME B18.2.2 Heavy Hex Nut Dimensions (mm)

Nominal Size Basic Major Diameter Width Across Flats, F Width Across Corners, G Thickness, H Maximum Runout of Bearing Surface to Thread Axis, FIM
Basic Min. Max. Min. Max. Basic Min. Max. Up to 150k psi 150k psi +
1/4 6.350 12.700 12.395 12.700 14.122 14.656 5.953 5.537 6.350 0.432 0.279
5/16 7.938 14.288 13.868 14.275 15.799 16.510 7.541 7.112 7.976 0.508 0.305
3/8 9.525 17.463 16.993 17.475 19.380 20.168 9.128 8.661 9.576 0.533 0.356
7/16 11.113 19.050 18.491 19.050 21.082 21.996 10.716 10.236 11.201 0.559 0.381
1/2 12.700 22.225 21.590 22.225 24.613 25.654 12.303 11.786 12.802 0.584 0.406
9/16 14.288 23.813 23.089 23.825 26.340 27.508 13.891 13.360 14.427 0.610 0.432
5/8 15.875 26.988 26.187 26.975 29.845 31.166 15.478 14.910 16.027 0.635 0.457
3/4 19.050 31.750 30.785 31.750 35.103 36.652 18.653 18.034 19.253 0.686 0.508
7/8 22.225 36.513 35.408 36.525 40.361 42.164 21.828 21.158 22.479 0.737 0.559
1 25.400 41.275 40.005 41.275 45.618 47.650 25.003 24.282 25.705 0.787 0.610
1 1/8 28.575 46.038 44.602 46.025 50.851 53.162 28.178 27.407 28.931 0.838 0.686
1 1/4 31.750 50.800 49.225 50.800 56.109 58.649 31.353 30.150 31.775 0.889 0.762
1 3/8 34.925 55.563 53.823 55.575 61.366 64.160 34.528 33.274 35.001 0.965 0.838
1 1/2 38.100 60.325 58.420 60.325 66.599 69.647 37.703 36.398 38.227 1.041 0.914
1 5/8 41.275 65.088 63.017 65.075 71.831 75.159 40.878 39.522 41.453 1.118 0.965
1 3/4 44.450 69.850 67.615 69.850 77.089 80.645 44.053 42.647 44.679 1.219 1.041
1 7/8 47.625 74.613 72.238 74.625 82.347 86.157 47.228 45.771 47.904 1.295 1.118
2 50.800 79.375 76.835 79.375 87.605 91.643 50.403 48.895 51.130 1.397 1.194
2 1/4 57.150 88.900 86.055 88.900 98.095 102.641 56.753 54.737 57.175 1.549 1.321
2 1/2 63.500 98.425 95.250 98.425 108.585 113.640 63.103 60.985 63.627 1.727 1.473
2 3/4 69.850 107.950 104.445 107.950 119.075 124.638 69.453 67.234 70.079 1.880 1.626
3 76.200 117.475 113.665 117.475 129.591 135.636 75.803 73.482 76.530 2.057 1.778
3 1/4 82.550 127.000 122.885 127.000 140.081 146.660 81.756 79.350 82.601 2.210 1.905
3 1/2 88.900 136.525 132.080 136.525 150.571 157.658 88.106 85.598 89.052 2.388 2.057
3 3/4 95.250 146.050 141.275 146.050 161.061 168.656 94.456 91.846 95.504 2.540 2.210
4 101.600 155.575 150.495 155.575 171.577 179.654 100.806 98.095 101.956 2.718 2.362

ASME B18.2.2 Heavy Hex Nut Dimensions (Inch)

Nominal Size Basic Major Diameter Width Across Flats, F Width Across Corners, G Thickness, H Maximum Runout of Bearing Surface to Thread Axis, FIM
Basic Min. Max. Min. Max. Basic Min. Max. Up to 150k psi 150k psi +
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 4.0000 6 1/8 5.925 6.125 6.755 7.073 3 15/16 3.862 4.014 0.107 0.093