ASME B18.2.2 Heavy Hex Flat Nuts
Dimensions of Heavy Hex Flat Nuts
| Nominal 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 |