Diall M8 Coach Bolt & Nut - 80mm - Pack of 10
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Product Information
Full details
The Diall M8 Coach Bolt & Nut pack is designed for DIY enthusiasts and construction professionals needing secure fastening solutions for heavy-duty timber projects. These 80mm carbon steel bolts provide excellent structural integrity and corrosion resistance thanks to their zinc-plated finish; however, users should note that the partial threading requires careful measurement to ensure the non-threaded shank does not interfere with the joinery thickness.
All features
| Brand | Diall |
|---|
Extended Product Information
FAQs
Are these bolts suitable for outdoor use?
Yes, the zinc plating offers protection against rust, making them suitable for outdoor use in protected or semi-exposed environments.
Can these be used in masonry?
No, these are specifically designed for timber applications and will not hold securely in concrete or brick without specific wall anchors.
What is the thread length of these bolts?
These bolts feature a partial thread length of 22mm.
Do these come with washers?
The pack includes the nuts and bolts; if your project requires washers for load distribution, they should be purchased separately.
Can I paint these bolts?
Yes, once installed, you can use a metal-compatible primer and paint to match the aesthetics of your timber structure.
Troubleshooting
Bolt head keeps rotating while tightening the nut.
Use a hammer to tap the bolt head firmly into the wood so the square shoulder sits flush, effectively locking it in place.
Timber is splitting during insertion.
Ensure you have drilled an adequate pilot hole and that the bolt diameter matches your drill bit size.
Bolt is too long for the connection point.
Add appropriate washers to the bolt to take up the excess length or cut the bolt to size using a metal hacksaw, ensuring you clean the threads afterward.
Pros and Cons
Pros
- High-strength carbon steel ensures long-term structural reliability
- Zinc plating prevents premature corrosion in humid environments
- Standardized M8 size is compatible with a wide range of common tools
- Pack of 10 provides enough hardware for medium-sized projects
Cons
- Not suitable for marine or highly corrosive environments without additional sealant
- Partial thread design limits usability in very thin materials
- Requires manual drilling of pilot holes for best results
Setup, Compatibility & Care
- Preparation: Measure the thickness of your timber to confirm that the 80mm length allows the bolt to protrude sufficiently for the nut and washer.
- Drilling: Use an 8mm or slightly larger drill bit to create a clearance hole through the timber.
- Insertion: Tap the bolt through the wood using a mallet; the square shoulder will bite into the wood, securing the bolt head.
- Tightening: Use an M8-compatible wrench or socket set to tighten the nut. Ensure you do not over-tighten, which could crush the wood fibers.
- Maintenance: Periodically inspect connections for signs of timber shrinkage or loosening, and tighten the nuts as necessary to maintain structural integrity.