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Step Bolt
Features a smooth domed head and a square portion protruding from under the head. The square prevents the bolt from turning when tightening when inserted into a matching square hole. Similar to a carriage bolt but it has a wider and lower profile head.
Dimensions
ASME B18.5
| Thread Dia. | Head Dia. | Square Width | Square Depth |
|---|---|---|---|
| No. 10 | 0.625 - 0.656 | 0.185 - 0.199 | 0.094 - 0.125 |
| 1/4 | 0.813 - 0.844 | 0.245 - 0.260 | 0.125 - 0.156 |
| 5/16 | 1.000 - 1.031 | 0.307 - 0.324 | 0.156 - 0.187 |
| 3/8 | 1.188 - 1.219 | 0.368 - 0.388 | 0.188 - 0.219 |