Timber Bolts

Timber bolts have a large, dome-shaped head with a wide bearing surface and a nib or fin neck that locks into wood. Designed for heavy timber, dock, and marine construction, the broad head spreads load and resists pulling through, while the neck prevents the bolt from spinning. We stock timber bolts in high-strength galvanized steel for demanding wood structures.

Why Timber Bolts

In heavy timber framing, docks, retaining walls, and marine structures, the large dome head distributes clamp load over a wide area so it won't crush or pull through softwood timbers, and the finished round head leaves no sharp edges. The nib or fin under the head embeds in the wood to lock the bolt against rotation, allowing tightening from the nut side — much like a carriage bolt but built for heavier timber.

Neck Types

Timber bolts use a nib (fin) neck or ribbed neck that bites into the timber to prevent spinning. The wide, shallow dome head bears on the wood surface. Match the neck style to the timber and the hole as appropriate.

Materials and Finishes

Almost always hot-dip galvanized steel for the wet, exposed environments timber bolts serve (docks, marine, outdoor timber), and available in stainless for maximum corrosion resistance in coastal and submerged applications and with treated lumber.

Selecting the Right Timber Bolt

Match the length to the timber thickness plus the nut and washer, and the diameter to the load. Choose hot-dip galvanized or stainless for outdoor, marine, and treated-lumber use. Ensure the neck fully seats to lock rotation, and use a washer and nut on the back side. The wide head should bear flat on the timber.

Use the filters to narrow by size, length, and finish.