ASME B18.2.2 Heavy Hex Flat Nuts

ASME B18.2.2 Heavy Hex Flat Nuts and Flat Jam Nuts

Dimensions of Heavy Hex Flat Nuts

Nominial Size Basic Major Diameter of Thread Width Across Flats, F Width Across Corners, G Thickness Flat Nuts, H Bearing Surface Runout to Thread Axis, FLM
Basic Min. Max. Min. Max. Basic Min. Max.
1 1/8 1.1250 1 13/16 1.756 1.812 2.002 2.093 1 1/8 1.079 1.155 0.032
1 1/4 1.2500 2 1.938 2.000 2.209 2.309 1 1/4 1.187 1.282 0.034
1 3/8 1.3750 2 3/16 2.119 2.188 2.416 2.526 1 3/8 1.310 1.409 0.038
1 1/2 1.5000 2 3/8 2.300 2.375 2.622 2.742 1 1/2 1.433 1.536 0.041
1 3/4 1.7500 2 3/4 2.662 2.750 3.035 3.175 1 3/4 1.679 1.790 0.048
2 2.0000 3 1/8 3.025 3.125 3.449 3.608 2 1.925 2.044 0.054
2 1/4 2.2500 3 1/2 3.388 3.500 3.862 4.041 2 1/4 2.155 2.298 0.061
2 1/2 2.5000 3 7/8 3.750 3.875 4.275 4.474 2 1/2 2.401 2.552 0.067
2 3/4 2.7500 4 1/4 4.112 4.250 4.688 4.907 2 3/4 2.647 2.806 0.074
3 3.0000 4 5/8 4.475 4.625 5.102 5.340 3 2.893 3.060 0.080
3 1/4 3.2500 5 4.838 5.000 5.515 5.774 3 1/4 3.124 3.314 0.087
3 1/2 3.5000 5 3/8 5.200 5.375 5.928 6.207 3 1/2 3.370 3.568 0.093
3 3/4 3.7500 5 3/4 5.562 5.750 6.341 6.640 3 3/4 3.616 3.822 0.100
4 4.0000 6 1/8 5.925 6.125 6.755 7.073 4 3.862 4.076 0.106