Timco Carriage Bolts & Hex Nuts - Silver

The square shoulder is designed to grip into the timber, preventing the bolt from spinning when you tighten the nut. This allows for secure fastening from one side.

Yes, each carriage bolt comes supplied with a matching hex nut.

These bolts are suitable for most types of timber. Hardwoods will provide a firmer grip for the anti-spin shoulder compared to very soft woods.

While they provide secure fastening for timber structures like fences, decks, and furniture, they are primarily intended for clamping timber and attaching ironmongery, not for heavy-duty structural load-bearing applications unless specified by engineering codes.

Measure the combined thickness of the two pieces of timber you are joining. Choose a bolt length that allows the nut to be fully engaged on the threads, ideally with a few threads showing beyond the nut.

Yes, washers can be used under the bolt head and/or the nut to help distribute the load and protect the timber surface.

'Fully threaded' means the thread runs the entire length of the bolt shaft up to the head. 'Partially threaded' means the thread only covers a portion of the shaft, leaving a smooth shank section near the head. Bolts up to 150mm are fully threaded, and longer ones are partially threaded.

Ensure the square shoulder of the bolt is fully seated into the timber. The wood may be too soft, or the hole too large. Try using a washer under the nut or re-drilling a slightly smaller hole if possible.

Check if the bolt and nut are of the same thread size (e.g., M8). Ensure there is no damage to the bolt's threads. Clean any debris from the threads.

Select a longer carriage bolt. Ensure there is sufficient thread engagement (at least 2-3 full threads) visible on the nut after tightening.

The hole may be too shallow or not perfectly round. Enlarge the recess slightly for the bolt head or ensure the hole is drilled perpendicular to the surface.