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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 | 7/16 | 0.425 | 0.438 | 0.554 | 0.619 | 7/32 | 0.203 | 0.235 |
| 5/16 | 0.3125 | 9/16 | 0.547 | 0.562 | 0.721 | 0.795 | 17/64 | 0.249 | 0.283 |
| 3/8 | 0.3750 | 5/8 | 0.606 | 0.625 | 0.802 | 0.884 | 21/64 | 0.310 | 0.346 |
| 7/16 | 0.4375 | 3/4 | 0.728 | 0.750 | 0.970 | 1.061 | 3/8 | 0.356 | 0.394 |
| 1/2 | 0.5000 | 13/16 | 0.788 | 0.812 | 1.052 | 1.149 | 7/16 | 0.418 | 0.458 |
| 5/8 | 0.6250 | 1 | 0.969 | 1.000 | 1.300 | 1.414 | 35/64 | 0.525 | 0.569 |
| 3/4 | 0.7500 | 1 1/8 | 1.088 | 1.125 | 1.464 | 1.591 | 21/32 | 0.632 | 0.680 |
| 7/8 | 0.8750 | 1 5/16 | 1.269 | 1.312 | 1.712 | 1.856 | 49/64 | 0.740 | 0.792 |
| 1 | 1.0000 | 1 1/2 | 1.450 | 1.500 | 1.961 | 2.121 | 7/8 | 0.847 | 0.903 |
| 1 1/8 | 1.1250 | 1 11/16 | 1.631 | 1.688 | 2.209 | 2.386 | 1 | 0.970 | 1.030 |
| 1 1/4 | 1.2500 | 1 7/8 | 1.812 | 1.875 | 2.458 | 2.652 | 1 3/32 | 1.062 | 1.126 |
| 1 3/8 | 1.3750 | 2 1/16 | 1.944 | 2.062 | 2.708 | 2.917 | 1 13/64 | 1.169 | 1.237 |
| 1 1/2 | 1.5000 | 2 1/4 | 2.175 | 2.250 | 2.956 | 3.182 | 1 5/16 | 1.276 | 1.348 |