Timber Bolts

Timber bolts are a type of fastener often used in wood and marine applications. The underside of the oversized, rounded bolt head has several nubs or fins (usually two to four) which prevent the bolt’s rotation in the timber.

Frequently Asked Questions on Timber Bolts:

What’s the difference between a timber bolt and carriage bolt?

Carriage bolts are used for a wider variety of projects, whereas timber bolts are primarily used for wood and marine applications. From a locking mechanism standpoint, carriage bolts have a slightly smaller head and a short square neck, whereas timber bolts have a slightly larger head and sharp fins or ribs.

Can timber bolts be used in pressure-treated lumber?

Only if they are made from materials that are corrosion-resistant, such as hot-dipped galvanized bolts.

Do timber bolts require washers?

They do not on the bolt head end, due to the oversized head of the timber bolt. This reduces costs significantly.

What materials are timber bolts available in?

We carry hot dipped galvanized timber bolts. Our sizes range from 3/4” and 5/8” diameters with lengths ranging from 6” up to 26”.

What else is a timber bolt called?

Timber bolts are also frequently called dome head, fender head, safety head, and mushroom head bolts.