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Frame Bolt
Mostly used on truck frames. It has a flange under the head that works the same as a washer to distribute the load. Often made with fine threads.
Dimensions
ASME B18.2.1
| Thread Dia. | Across Flats | Flange Dia. |
|---|---|---|
| 1/4 | 3/8 | 0.56 |
| 5/16 | 1/2 | 0.68 |
| 3/8 | 9/16 | 0.81 |
| 7/16 | 5/8 | 0.93 |
| 1/2 | 3/4 | 1.07 |
| 5/8 | 15/16 | 1.33 |
| 3/4 | 1 1/8 | 1.59 |