M10 (10mm) Hex Head Coach Screws | Heavy Duty BZP Lag Bolts | DIN 571

Achieve strong, reliable joints in heavy timber construction with our professional-grade M10 Hex Head Coach Screws. Also known as lag bolts or lag screws, these heavy-duty fasteners are the essential choice for projects demanding exceptional strength and holding power. They are designed for ease of use and long-term durability, making them a staple for both professional tradespeople and serious DIY enthusiasts across the UK.

Whether you're building a robust decking frame, landscaping with railway sleepers, or undertaking structural timber work, our M10 coach screws provide the secure fixing you can depend on.

Key Features & Benefits:

• High-Torque Hex Head: The classic hexagon head is designed for a non-slip grip with a standard 17mm spanner or socket, allowing for high torque application and ensuring a fast, easy, and secure installation without the risk of stripping the head.

• Corrosion Resistant Finish: Each screw is protected by a Bright Zinc Plated (BZP) finish, providing excellent resistance to corrosion and rust. This ensures long-lasting performance and a clean appearance for both interior and sheltered exterior projects.

• Aggressive Coarse Thread: The deep, coarse wood thread is engineered to bite aggressively into both softwood and hardwood. This design provides exceptional grip and superior pull-out resistance, creating strong joints that will not loosen over time.

• DIN 571 Certified Quality: Manufactured to the internationally recognised DIN 571 standard, our coach screws guarantee consistent dimensional accuracy, material strength, and reliable performance, giving you complete confidence in every fixing.

Common Applications:

Our M10 coach screws are incredibly versatile and are the ideal fixing solution for a wide range of heavy-duty applications, including:

• Decking and veranda subframes

• Securing railway sleepers for garden landscaping

• All types of timber framing and structural joinery

• Fixing fence posts and heavy-duty panels

• Attaching gate posts, hinges, and ironmongery

• Assembling pergolas, carports, and garden structures

• Securing wall plates to masonry (with nylon plugs)

Installation Guide:

For a professional finish and the strongest possible fixing, follow these simple guidelines:

1. Pilot Hole: We recommend drilling a pilot hole to prevent the wood from splitting and to ensure the screw drives in straight. For M10 screws, a 6-7mm pilot hole is suitable for most softwoods, while a 7-8mm hole is recommended for hardwoods.

2. Driving: Use a 17mm socket with a ratchet or impact driver, or a 17mm spanner, to drive the screw until the head is firmly seated against the timber surface. Using a washer under the head is recommended to spread the load.

3. Masonry Fixing: To fix timber to brick or concrete, drill a hole to accommodate an M12 nylon wall plug. Insert the plug, align your timber, and drive the M10 coach screw securely into the plug.

Technical Specification: