DIYUK Coach Screws - Silver - M12

Name: DIYUK Coach Screws - Silver - M12
Brand: DIYUK
SKU: 5zapmyfwzf
Availability: InStock

Installation of our 12mm Hex Head Coach Screws is straightforward, thanks to their user-friendly d...

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M12 Hexagon Coach Screws Heavy Duty Lag Bolts Wood Screws Din 571 5056826600240

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B&Q - M12 12mm Coach Screws Length: 180mm ( Pack Of: 1 ) Hex Hexagon Head Lag Bolts Wood Screws Steel Zinc Plated Din 571

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OnBuy.comM12 Hexagon Coach Screws Heavy Duty Lag Bolts Wood Screws Din 571 5056826600240

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B&QB&Q - M12 12mm Coach Screws Length: 180mm ( Pack Of: 1 ) Hex Hexagon Head Lag Bolts Wood Screws Steel Zinc Plated Din 571

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£7.58

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Product Information

Full details

The DIYUK M12 Coach Screws are designed for both professional contractors and DIY enthusiasts who require high-strength fastening for structural projects in wood or concrete. These lag bolts provide exceptional holding power and long-term durability thanks to their zinc-plated steel construction, though users should ensure they have the correct socket size for the 12mm hex head before starting their installation.

All features

Colour	Silver
Model Part Number	M12
Brand	DIYUK

Extended Product Information

FAQs

Do I need to pre-drill holes?

Yes, pre-drilling is highly recommended to prevent timber splitting and to ensure the bolt drives straight.

Can these be used outdoors?

Yes, the zinc plating provides a protective layer against environmental factors, making them suitable for most outdoor applications.

What size socket do I need?

M12 coach screws typically require a 19mm socket or wrench.

Can I use these in brickwork?

Yes, provided you use an appropriate masonry wall plug that is compatible with M12 bolt diameters.

Are these bolts reusable?

While they are technically reusable, check the threads and the hex head for damage or excessive wear before reinstalling them.

Troubleshooting

Bolt head rounding during installation

Ensure the socket is the correct size and fully seated; use a torque wrench to avoid over-tightening.

Timber splitting when driving the screw

The pilot hole is likely too small or non-existent; increase the pilot hole diameter slightly.

Screw spinning in concrete

The hole is too large for the plug. Use a smaller drill bit or a high-expansion masonry anchor.

Pros and Cons

Pros

Easy to drive using standard socket or spanner tools
High-grade steel provides excellent shear strength
Zinc plating offers effective rust protection
Suitable for demanding structural and carpentry applications

Cons

Requires pre-drilling pilot holes in dense hardwoods or concrete
Requires specific hex socket size for installation
Not intended for use in high-acidity or highly corrosive marine environments without additional protection

Setup, Compatibility & Care

Pre-drilling: Always drill a pilot hole smaller than the shank diameter of the screw to prevent timber splitting.
Tool Selection: Use a high-quality hex socket set. Ensure the socket is fully seated on the head before applying force to prevent rounding.
Compatibility: When using in concrete, ensure you use high-quality nylon or plastic wall plugs designed for M12 bolts.
Maintenance: Periodic inspection of the bolt head is recommended for outdoor projects to ensure the zinc coating remains intact; if surface rust appears, a touch-up with a cold-galvanizing spray can prevent further degradation.