TIMco Carriage Bolts & Hex Nuts - Silver - 0870CB

Name: TIMco Carriage Bolts & Hex Nuts - Silver - 0870CB
Brand: TIMco
SKU: iofef7eond
Availability: InStock

A domed head bolt with a square anti-spin shoulder, primarily used for clamping timber or attachin...

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Timco 0.0 X 100Mm Carriage Bolts & Hex Nuts - Zinc - Timpac Of 4 08100Cbp

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Product Information

Full details

The TIMco M8 x 70mm Carriage Bolts are ideal for professional contractors and DIY enthusiasts who need a reliable fastening solution for timber projects or securing heavy ironmongery. These bolts feature a unique domed head with an anti-spin square shoulder that locks securely into wood, providing a clean, professional finish with superior holding power. While they are highly effective for external and internal timber applications, they are designed specifically for use in pre-drilled pilot holes to ensure the square shoulder seats correctly without damaging the wood fibers.

All features

Colour	Silver
Model Part Number	PTDTIM0870CB
Brand	TIMco

Extended Product Information

FAQs

Can these bolts be used for outdoor decking?

Yes, they are suitable for outdoor timber use due to their zinc finish, though we recommend stainless steel washers to prevent galvanic corrosion.

Does the bolt come with a washer?

This specific pack includes the carriage bolts and matching hex nuts; washers are generally sold separately.

What size drill bit should I use for an M8 bolt?

It is recommended to use an 8.5mm to 9mm drill bit to ensure the bolt fits through easily while allowing the square shoulder to grip.

Are these bolts fully threaded?

Yes, this specific 70mm length falls under the category of being fully threaded, providing maximum clamping versatility.

What does Grade 4.8 mean?

Grade 4.8 refers to the tensile strength of the carbon steel, which is standard for general construction and medium-duty fastening applications.

Troubleshooting

Bolt rotates while tightening the nut

Ensure the pilot hole is clean and the square shoulder has been tapped firmly into the wood so it can grip properly.

Nut is difficult to thread onto the bolt

Check the threads for any debris or paint and ensure the nut is perfectly aligned before turning; do not force it if there is resistance to avoid cross-threading.

Pros and Cons

Pros

Secure anti-spin design prevents bolt rotation
High-quality Grade 4.8 carbon steel construction
Zinc finish offers reliable protection against rust
Complete set includes necessary hex nuts
Clean, professional-looking domed head

Cons

Requires pre-drilled holes for correct seating
Not suitable for high-acidity environments without extra protection
Square shoulder can damage soft timber if not installed carefully

Setup, Compatibility & Care

To install these bolts effectively, first ensure you have drilled a pilot hole slightly larger than the 8mm thread diameter of the bolt. For best results, use a spade bit or a standard twist drill bit to match the depth required for the square shoulder to fully recess.

Compatibility: These bolts use standard M8 threading, compatible with all standard M8 hex nuts and washers. When using them outdoors, it is recommended to pair them with stainless steel or galvanized washers to prevent wood staining and prolong the lifespan of the zinc coating. Regular inspection of the nuts is recommended to ensure they remain tight, especially in structures subject to vibration, like gate hinges. Keep the bolts clean and avoid using aggressive chemical cleaners that could strip the protective zinc plating.