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Timber bolts are also referred to as dome head, Weather-Tuff, economy, fender head, safety head, and mushroom head bolts. They are used in marine and wood applications.
The underside of the large, rounded, low-profile head of a timber bolt has two nubs or fins which prevent the bolt from turning in the timber. The oversized timber bolt head eliminates the need for a malleable iron washer, and therefore reduces costs.
Portland Bolt manufactures timber bolts from 1/2" diameter through 1-1/2" diameter in most ASTM, AASHTO, and SAE specifications. Special timber bolt tooling can be created to produce nonstandard head dimensions or bolt heads with your company's name and/or logo.
Bolt lengths ≤ 6": Thread length = (2 X diameter) + 1/4"
Bolt lengths > 6": Thread length = (2 X diameter) + 1/2"
Note: Most stock hex bolts longer than 12" in length will have 6" of thread.
Grade: A307
Diameters: 3/4"
Lengths: 8" - 36" in 2" increments
Origin: Domestic
Finish: Hot-dip galvanized
Bolt lengths ≤ 12": 4" thread
Bolt lengths 14"-16": 6" thread
Bolt lengths ≥ 18": 8" thread
| Bolt Diameter | D | F | H |
|---|---|---|---|
| Body Diameter Max |
Head Diameter | Head Height | |
| 3/8 | 0.388 | 1-5/16 | 3/16 |
| 1/2 | 0.515 | 1-1/2 | 1/4 |
| 5/8 | 0.642 | 1-15/16 | 5/16 |
| 3/4 | 0.768 | 2-1/4 | 3/8 |
| 7/8 | 0.895 | 2-5/8 | 7/16 |
| 1 | 1.022 | 2-7/8 | 1/2 |
| 1-1/8 | 1.149 | 2-7/8 | 1/2 |
| 1-1/4 | 1.277 | 2-7/8 | 1/2 |
| 1-3/8 | 1.404 | 2-7/8 | 1/2 |
| 1-1/2 | 1.531 | 2-7/8 | 1/2 |
