What is a Coach Bolt?
Coach bolts are strong fasteners used for joining large pieces of timber. Unlike coach screws, which screw into wood, coach bolts need a nut to hold them in place. They are easily recognisable by the square section under the domed head, which locks into the timber to prevent spinning.
Also known as
Carriage bolts, cup-square hex, mushroom-head bolts and wood bolts.
Why use Coach Bolts?
Coach bolts are ideal for heavy-duty timber projects because they’re secure, tamper-proof, and leave a flat finish with no sharp corners. The square section locks in the wood, so you can tighten the nut with one hand without holding the bolt head. Their long threads make them suited for various applications.
Perfect for:
- Landscaping projects like fencing and decking.
- Roof trusses in construction and house-building.
- Outdoor furniture, playground equipment and shelters.
- Wooden packaging like strong crates and boxes.
Coach Bolts: How they work
Drill a pilot hole the same diameter as the
