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Toresca Fasteners, LLC
The headless Allen bolt or stud bolt in general is a fully threaded rod and at one of its ends it has a hole for an Allen key and at the other a point that presses strongly against the second union piece.
| Diameter | From | Until |
| 5/32" | 3/16" | 7/8" |
| 3/16" | 3/16" | 1" |
| 1/4" | 3/16" | 1.1/2" |
| 5/16" | 1/4" | 1.1/2" |
| 3/8" | 1/4" | 2" |
| 7/16" | 1/2" | 1.1/2" |
| 1/2" | 3/8" | 2" |
| 5/8" | 5/8" | 2.1/2" |
| 3/4" | 1.1/4" | 3" |
