Forgefix Carriage Bolt & Nut - M8 x 150mm - Bag 10 - White

M8 refers to the metric thread diameter of 8 millimeters. The 150 indicates the bolt's length is 150 millimeters from the underside of the head to the tip of the thread.

Yes, these Forgefix coach bolts are zinc-plated, which provides good corrosion resistance, making them suitable and durable for various outdoor timber applications.

No, these particular coach bolts are designed for 'low load bearing' applications. For heavy-duty or critical structural constructions, you should consult an engineer and use fasteners specifically rated for high loads.

You will need a drill to create a pilot hole in your timber, and a spanner or wrench of the appropriate size (for M8 nuts) to tighten the hex nuts.

The square neck design is crucial for timber applications. It's designed to embed into the wood when installed, preventing the bolt from rotating while you tighten the nut from the other side, ensuring a secure and stable fastening.

Washers are not included but are often recommended. They help distribute the load over a wider area of the timber, preventing the nut from digging into the wood and potentially damaging the surface or compromising the joint's integrity over time.

This indicates the square neck isn't fully embedded in the timber. Remove the bolt, ensure the pilot hole allows the square neck to bite, and firmly tap the bolt head with a hammer (using a block of wood to protect the head) until the square neck is fully seated in the wood.

Check the pilot hole size. It might be too small, or the holes in the two timber pieces might not be perfectly aligned. Re-drill or re-align as necessary, ensuring the hole is straight and clear.

Ensure you are using the correct size wrench/spanner for an M8 nut to prevent stripping. If the nut is already stripped, replace it with a new M8 hex nut. Avoid over-tightening, which can damage both the nut and the timber.