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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.
| Colour | Silver |
|---|---|
| Model Part Number | PTDTIM0870CB |
| Brand | TIMco |
Yes, they are suitable for outdoor timber use due to their zinc finish, though we recommend stainless steel washers to prevent galvanic corrosion.
This specific pack includes the carriage bolts and matching hex nuts; washers are generally sold separately.
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.
Yes, this specific 70mm length falls under the category of being fully threaded, providing maximum clamping versatility.
Grade 4.8 refers to the tensile strength of the carbon steel, which is standard for general construction and medium-duty fastening applications.
Ensure the pilot hole is clean and the square shoulder has been tapped firmly into the wood so it can grip properly.
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.
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.
