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| Nomianal Size or Basic product Diameter | Full-Size Body Diameter, E | Width Across Flats, F | Width Across Corners, G | Head Height, H | Radius of Fillet, R | Thread Length for Bolt Lengths, LT | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 6 in. & Shorter | Over 6 in. | ||||||||||||
| Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Max. | Min. | Nom. | Nom. | ||
| 1/4 | 0.2500 | 0.260 | 0.237 | 0.375 | 0.362 | 0.530 | 0.498 | 0.188 | 0.156 | 0.03 | 0.01 | 0.750 | 1.000 |
| 5/16 | 0.3125 | 0.324 | 0.298 | 0.500 | 0.484 | 0.707 | 0.665 | 0.220 | 0.186 | 0.03 | 0.01 | 0.875 | 1.125 |
| 3/8 | 0.3750 | 0.388 | 0.360 | 0.562 | 0.544 | 0.795 | 0.747 | 0.268 | 0.232 | 0.03 | 0.01 | 1.000 | 1.250 |
| 7/16 | 0.4375 | 0.452 | 0.421 | 0.625 | 0.603 | 0.884 | 0.828 | 0.316 | 0.278 | 0.03 | 0.01 | 1.125 | 1.375 |
| 1/2 | 0.5000 | 0.515 | 0.482 | 0.750 | 0.725 | 1.061 | 0.995 | 0.348 | 0.308 | 0.03 | 0.01 | 1.250 | 1.500 |
| 5/8 | 0.6250 | 0.642 | 0.605 | 0.938 | 0.906 | 1.326 | 1.244 | 0.444 | 0.400 | 0.06 | 0.02 | 1.500 | 1.750 |
| 3/4 | 0.7500 | 0.768 | 0.729 | 1.125 | 1.088 | 1.591 | 1.494 | 0.524 | 0.476 | 0.06 | 0.02 | 1.750 | 2.000 |
| 7/8 | 0.8750 | 0.895 | 0.852 | 1.312 | 1.269 | 1.856 | 1.742 | 0.620 | 0.568 | 0.06 | 0.02 | 2.000 | 2.250 |
| 1 | 1.0000 | 1.022 | 0.976 | 1.500 | 1.450 | 2.121 | 1.991 | 0.684 | 0.628 | 0.09 | 0.03 | 2.250 | 2.500 |
| 1 1/8 | 1.1250 | 1.149 | 1.098 | 1.688 | 1.631 | 2.386 | 2.239 | 0.780 | 0.720 | 0.09 | 0.03 | 2.500 | 2.750 |
| 1 1/4 | 1.2500 | 1.277 | 1.223 | 1.875 | 1.812 | 2.652 | 2.489 | 0.876 | 0.812 | 0.09 | 0.03 | 2.750 | 3.000 |
| 1 3/8 | 1.3750 | 1.404 | 1.345 | 2.062 | 1.994 | 2.917 | 2.738 | 0.940 | 0.872 | 0.09 | 0.03 | 3.000 | 3.250 |
| 1 1/2 | 1.5000 | 1.531 | 1.470 | 2.250 | 2.175 | 3.182 | 2.986 | 1.036 | 0.964 | 0.09 | 0.03 | 3.250 | 3.500 |