Diall M12 Coach Bolt & Nut - L140mm, Pack Of 5
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Product Information
Full details
This guide is for DIY enthusiasts and tradespeople undertaking timber-based projects. The Diall M12 Coach Bolt & Nut pack offers a durable and secure fastening solution for wood constructions, providing reliability for your builds. A potential consideration is their specific recommendation for timber, limiting their broad application on other materials.
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| Brand | Diall |
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Extended Product Information
FAQs
What is the purpose of the square neck on a coach bolt?
The square neck is designed to grip into the timber when the nut is tightened. This prevents the bolt from spinning, allowing you to tighten the nut effectively with one hand.
Can I use these bolts for outdoor decking?
Yes, these bolts are suitable for timber-based outdoor projects like decking frames, provided the timber is appropriately treated for outdoor use and the zinc plating is maintained.
What tools are needed to install these bolts?
You will need a drill to create the pilot hole, and a spanner or wrench to tighten the M12 nut. A socket wrench can also be effective.
Are these bolts suitable for structural load-bearing applications?
Yes, the M12 diameter and carbon steel construction make them suitable for many structural load-bearing applications in timber construction.
How much torque should I apply when tightening?
There is no specific torque setting provided. Tighten until the joint is firm and secure. Over-tightening can strip the threads or crush the timber, so apply firm but controlled pressure.
Can I cut these bolts to a shorter length?
While technically possible with appropriate metal cutting tools, it is not recommended. Cutting may expose the raw carbon steel, reducing corrosion resistance, and could damage the threads. It is best to use the provided 140mm length or select a bolt of a different size if needed.
Troubleshooting
Bolt head spins when tightening the nut.
Ensure the square neck of the coach bolt is fully seated and gripped in the timber. If the hole is too large, you may need to use a slightly larger bolt or wood filler to create a snug fit.
Difficulty threading the nut onto the bolt.
Check that the bolt threads are not damaged or dirty. Clean the threads with a wire brush if necessary. Ensure you are using the correct M12 nut.
Corrosion forming on the zinc plating.
Minor corrosion can be cleaned with a mild abrasive. For significant corrosion, the parts may need to be replaced, especially if structural integrity is compromised. Consider protective coatings for harsh environments.
Pros and Cons
Pros
- Constructed from durable carbon steel for long-lasting performance.
- Zinc plating offers good protection against rust and corrosion.
- M12 size provides a strong and reliable connection point.
- Ideal length for securely fastening timber components.
- Supplied in a practical pack of five for common DIY tasks.
Cons
- Primarily recommended for timber, limiting use on metal or plastic.
- Partial threading may not be suitable for all joint thicknesses.
- Carbon steel may be heavier than aluminum or plastic alternatives.
- Zinc plating can wear down over time with significant abrasion or harsh conditions.
Setup, Compatibility & Care Instructions
Setup:
- Select the appropriate drill bit size for an M12 bolt to create a snug hole through the timber components.
- Insert the coach bolt through the pre-drilled holes, ensuring the square neck sits flush against the timber surface.
- Place the nut onto the threaded end of the bolt.
- Tighten the nut using a spanner or wrench until the joint is secure. Avoid over-tightening to prevent damaging the timber.
Compatibility:
- Recommended For: Softwood and hardwood timber applications.
- Not Recommended For: Metal, plastic, or applications requiring extreme corrosion resistance in marine environments.
Care:
- Periodically inspect the bolts and nuts for signs of wear or corrosion.
- If used in exposed outdoor conditions, consider applying a sealant or wax to the threads for extended protection.
- Clean any dirt or debris from the nuts and bolt heads to ensure proper function and visual appearance.