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| Nominal Size Inch |
Basic Major Thread Diameter |
Width Across Flats, F | Width Across Corners, G | Diameter Flange, B | Nut Thickness, H | Maximum Wrenching Length, J | Maximum Flange Thickness, K | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | ||||
| 1/4 | 0.2500 | 0.428 | 0.438 | 0.488 | 0.505 | 0.700 | 0.728 | 0.281 | 0.312 | 0.15 | 0.04 |
| 5/16 | 0.3125 | 0.489 | 0.500 | 0.557 | 0.577 | 0.790 | 0.820 | 0.343 | 0.375 | 0.20 | 0.04 |
| 3/8 | 0.3750 | 0.551 | 0.562 | 0.628 | 0.650 | 0.885 | 0.915 | 0.390 | 0.406 | 0.24 | 0.04 |
| 7/16 | 0.4375 | 0.675 | 0.688 | 0.768 | 0.794 | 1.100 | 1.131 | 0.437 | 0.468 | 0.26 | 0.04 |
| 1/2 | 0.5000 | 0.736 | 0.750 | 0.840 | 0.866 | 1.175 | 1.205 | 0.485 | 0.515 | 0.29 | 0.06 |
| 9/16 | 0.5625 | 0.861 | 0.875 | 0.982 | 1.010 | 1.260 | 1.300 | 0.546 | 0.578 | 0.37 | 0.06 |
| 5/8 | 0.6250 | 0.922 | 0.938 | 1.051 | 1.083 | 1.280 | 1.360 | 0.600 | 0.640 | 0.42 | 0.06 |