Coach Screw - M8 x 150mm - Silver

Coach screws are heavy-duty fasteners primarily used for joining large pieces of timber or for fixing heavy items to timber structures. They are also used with wall plugs for masonry applications.

Yes, it is highly recommended to pre-drill a pilot hole, especially in hardwoods, dense timber, or when fixing close to the edge. This prevents the timber from splitting and makes driving the screw easier.

You will need a drill for pre-drilling pilot holes and a socket driver of the correct size (typically an M8 socket) for driving the hexagon head screw.

Zinc plating is a coating applied to the steel screw to protect it from corrosion and rust. This increases the screw's durability and makes it suitable for both indoor and outdoor use, though for extreme outdoor conditions, further protection might be needed.

This specific coach screw is M8 x 150mm. 'M8' refers to its 8mm diameter, and '150mm' indicates its length.

Yes, due to their zinc-plated finish, these coach screws offer good resistance to corrosion and are suitable for outdoor applications such as fencing and garden structures.

DIN571 is a German industrial standard that specifies the dimensions and requirements for hexagonal head wood screws, ensuring quality and consistency in manufacturing.

Ensure a pilot hole has been pre-drilled. If a pilot hole exists, check that its diameter is appropriate for the screw; it might be too small. Make sure you are using a socket driver and applying steady, straight pressure.

This usually indicates the pilot hole is too small or missing, especially in hardwoods or when fixing close to an edge. Try increasing the pilot hole diameter slightly or relocating the screw further from the timber edge. Consider using a countersink bit if the head is causing too much stress.

Ensure you are using the correct size socket driver for an M8 screw. Apply firm, consistent pressure to keep the socket fully engaged with the screw head. Avoid using worn or ill-fitting tools.

Check if the pilot hole was too large, preventing proper thread engagement. For timber, sometimes over-tightening can strip the wood fibers, leading to looseness. For existing loose screws, consider removing, filling the hole with a wood filler or dowel, and re-drilling a new pilot hole slightly offset, or using a larger diameter screw if appropriate.