Forgefix Coach Bolt & Nut - White - M8 x 100mm - Pack of 10

No, these Forgefix Coach Bolts are specifically designed for low load-bearing applications only. For heavy structural components or critical load-bearing joints, you should consult with an engineer and select fasteners designed for higher stress.

For an M8 coach bolt, a pilot hole slightly larger than the bolt's shaft diameter, but smaller than the square neck, is typically recommended. A drill bit size between 9mm and 10mm is often suitable, depending on the density of the timber to ensure the square neck embeds properly.

Yes, the zinc-plated finish on these coach bolts provides good resistance to corrosion, making them suitable for outdoor timber projects like garden furniture, pergolas, and fence panels. However, prolonged exposure to harsh conditions may eventually affect the plating.

While not included in the pack, using a washer under the hex nut is generally recommended. Washers help to distribute the clamping force over a larger area, which can prevent the nut from digging into soft timber and create a more secure, lasting joint.

'M8' refers to the bolt's nominal diameter of 8 millimeters, indicating it has a metric thread. '100' indicates the bolt's length, which is 100 millimeters from the underside of the bolt head to the tip.

The square neck under the coach bolt's head is designed specifically to prevent this. Ensure the bolt is fully inserted and the square neck is hammered securely into the timber surface. This engagement locks the bolt in place, allowing you to tighten the nut without the bolt spinning.

While technically possible for the bolt to pass through metal, the square neck is designed to embed into timber for anti-rotation. For strong timber-to-metal connections, other types of fasteners like hex bolts with appropriate washers are often more suitable and provide better load distribution.

This usually means the square neck is not fully embedded in the timber. Remove the nut and firmly tap the bolt head with a mallet until the square neck bites into the wood and sits flush with the surface. Then re-attach and tighten the nut.

Check that your pilot hole is wide enough. The hole should be slightly larger than the bolt's shaft diameter, but not so large that the square neck cannot embed properly. Ensure the hole is clear of debris.

Ensure you are using the correct M8 hex nut. If the timber is soft, it might compress, making the joint feel loose. Consider adding a washer under the nut to distribute the load and prevent it from digging into the wood. Avoid overtightening as this can strip threads or damage timber.

Evaluate the environmental conditions. While zinc-plated offers resistance, it's not impervious to all corrosion, especially in highly acidic, salty, or constantly wet conditions. Ensure proper storage for unused bolts. For installed bolts, consider adding a protective paint or sealant over the bolt head and nut.