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| Nominal Size Inch | Basic Major Thread Diameter | Width Across Flats, F | Width Across Corners, G | Thickness, H | |||||
|---|---|---|---|---|---|---|---|---|---|
| Basic | Min. | Max. | Min. | Max. | Basic | Min. | Max. | ||
| 1/4 | 0.2500 | 1/2 | 0.488 | 0.500 | 0.640 | 0.707 | 1/4 | 0.218 | 0.266 |
| 5/16 | 0.3125 | 9/16 | 0.546 | 0.562 | 0.720 | 0.795 | 5/16 | 0.280 | 0.330 |
| 3/8 | 0.3750 | 11/16 | 0.688 | 0.699 | 0.889 | 0.973 | 3/8 | 0.341 | 0.393 |
| 7/16 | 0.4375 | 3/4 | 0.728 | 0.750 | 0.970 | 1.060 | 7/16 | 0.403 | 0.456 |
| 1/2 | 0.5000 | 7/8 | 0.850 | 0.875 | 1.137 | 1.237 | 1/2 | 0.464 | 0.520 |
| 5/8 | 0.6250 | 1 1/16 | 1.031 | 1.062 | 1.386 | 1.503 | 5/8 | 0.587 | 0.647 |
| 3/4 | 0.7500 | 1 1/4 | 1.212 | 1.25 | 1.635 | 1.768 | 3/4 | 0.710 | 0.774 |
| 7/8 | 0.8750 | 1 7/16 | 1.394 | 1.438 | 1.884 | 2.033 | 7/8 | 0.833 | 0.901 |
| 1 | 1.0000 | 1 5/8 | 1.575 | 1.625 | 2.132 | 2.298 | 1 | 0.956 | 1.028 |
| 1 1/8 | 1.1250 | 1 13/16 | 1.756 | 1.812 | 2.381 | 2.563 | 1 1/8 | 1.079 | 1.155 |
| 1 1/4 | 1.2500 | 2 | 1.938 | 2.000 | 2.631 | 2.828 | 1 1/4 | 1.187 | 1.282 |
| 1 3/8 | 1.3750 | 2 3/16 | 2.119 | 2.188 | 2.879 | 3.094 | 1 3/8 | 1.310 | 1.409 |
| 1 1/2 | 1.5000 | 2 3/8 | 2.300 | 2.375 | 3.128 | 3.359 | 1 1/2 | 1.433 | 1.536 |