Diall M8 Coach Bolt - M8 - Pack of 10
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Product Information
Full details
This guide is for DIY enthusiasts and tradespeople needing reliable fasteners for timber applications. The Diall M8 Coach Bolts offer a strong, durable connection with their carbon steel construction and organic coating, ideal for a variety of projects. A caveat to consider is their specific recommendation for timber use, meaning they may not be suitable for other materials.
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| Brand | Diall |
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Extended Product Information
FAQs
What is the primary material these bolts are designed for?
These M8 coach bolts are specifically recommended for use with timber.
What size nut and washer should I use with these bolts?
You should use M8 nuts and M8 washers with these M8 coach bolts.
How do I prevent the bolt from turning while tightening the nut?
The square section under the bolt's cup head is designed to grip into the timber, preventing rotation when the nut is tightened.
Are these bolts suitable for outdoor use?
They have an organic coating for some corrosion resistance, making them suitable for moderate outdoor use. For harsh or prolonged exposure, additional protective coatings are recommended.
What is the length of these bolts?
These coach bolts are 110mm in length.
Can I use these bolts on metal or plastic?
These bolts are recommended for timber. Their performance and corrosion resistance may vary significantly when used with other materials.
How many bolts are in a pack?
Each pack contains 10 coach bolts.
Troubleshooting
Bolt spins when trying to tighten the nut.
Ensure the square section of the bolt head is seated firmly into the timber. If the hole is too large or the wood is soft, the square may not get a good grip. Try using a washer between the bolt head and the timber if possible, or consider a slightly smaller hole if the wood is dense.
Bolt is not long enough for the combined thickness of materials.
This bolt is 110mm long. For thicker materials, you will need a longer coach bolt. Please check the required length before purchase.
Difficulty starting the bolt into the pre-drilled hole.
Ensure the hole is drilled straight and is the correct diameter (slightly larger than M8). Clear any debris from the hole and the bolt threads.
Visible rust or corrosion after installation.
The organic coating provides basic protection. For longer-term durability, especially in exposed environments, consider applying a protective coating like paint, varnish, or a rust inhibitor to the bolt and surrounding area.
Pros and Cons
Pros
- Robust construction for reliable holding power.
- Corrosion-resistant coating for outdoor or damp environments.
- Suitable size for significant timber projects.
- Cost-effective pack quantity for common DIY needs.
Cons
- Primarily recommended for timber, limiting use on other materials.
- 110mm length may be too long for some smaller projects.
- Requires appropriate tools for installation and tightening.
Setup, Compatibility & Care
Setup:
- Drill a hole slightly larger than the M8 diameter through the timber pieces you intend to join.
- Insert the coach bolt through the aligned holes, ensuring the cup square head sits flush on one side.
- Place an M8 washer and an M8 nut onto the threaded end of the bolt on the opposite side.
- Tighten the nut using appropriate wrenches to secure the pieces together. The square section under the bolt head will prevent it from turning.
Compatibility:
- These bolts are specifically recommended for use with timber.
- Ensure you use M8 nuts and washers for a secure and proper fit.
- The bolt requires a clearance hole of slightly more than 8mm in diameter.
Care:
- While the organic coating offers some protection, it is advisable to apply a suitable sealant or finish to the bolts and surrounding timber for extended outdoor use or in damp conditions.
- Store unused bolts in a dry place to prevent premature corrosion.