Forgefix Coach Bolt & Nut - White

Coach bolts (also known as carriage bolts) are primarily used for fastening timber to timber, or timber to metal, especially in applications where the bolt head needs to be flush or where access for tightening is only available from one side. They are ideal for garden furniture, pergolas, and fence panels.

'M8' refers to the metric thread size, indicating the bolt has an 8mm diameter thread. '50' refers to the bolt's length in millimeters, from the underside of the head to the tip of the bolt.

Yes, these Forgefix coach bolts are zinc-plated, which provides a good level of corrosion resistance, making them suitable for many outdoor applications where they may be exposed to weather.

Yes, it is highly recommended to pre-drill a pilot hole through the timber. This ensures a clean entry for the bolt, prevents the timber from splitting, and allows the square neck to properly seat itself without excessive force.

No, these particular coach bolts are specified for 'low load-bearing applications'. For heavy-duty construction or structural integrity in critical areas, stronger fasteners with higher shear and tensile strengths should be used.

This usually means the square neck isn't fully embedded or has stripped the timber. Ensure the pilot hole for the square neck is tight enough for it to bite properly. If the timber is soft or damaged, you might need to use a washer under the bolt head to create more friction, or consider reinforcing the timber around the bolt.

This can happen if the pilot hole for the square neck isn't deep enough, or if the timber is too hard for the square neck to fully embed. Apply steady pressure while tightening the nut, allowing the square neck to pull into the wood. If still not flush, you may need to slightly countersink the area around the bolt head.

Always measure the total thickness of the materials you are joining before selecting a bolt length. If the bolt is too short, it won't fully engage the nut; if too long, the excess thread can be unsightly or pose a snagging hazard. This specific product is M8 x 50mm; check other available variants for different lengths if needed.

While zinc-plated, severe conditions or damage to the plating can lead to rust. Clean off light rust with a wire brush and apply a rust-inhibiting paint or clear coat. For significant corrosion, the bolt should be replaced to ensure structural integrity.