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The Range£9.00Visit shop Unifix Pack Of 50 Coach Screws Hexagon Head Din 571 Bright Zinc Plated M6 X 65Mm
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Unifix Coach Screws are professional-grade fasteners designed for heavy-duty timber construction and structural framing. Ideally suited for contractors and DIY enthusiasts who require high-strength, reliable connections, these screws feature a robust hexagon head for high-torque driving. While they provide excellent holding power, their size and design require pre-drilling in most wood types to prevent splitting.
| Colour | Silver |
|---|---|
| Model Part Number | 1427427 |
| Brand | Unifix |
No, a standard socket wrench or spanner is the most effective way to drive these hexagon head screws.
Yes, the bright zinc plating offers good corrosion resistance, though they are best suited for sheltered outdoor areas rather than constant direct exposure to heavy rain or salt.
DIN 571 is a German industrial standard for hexagon head wood screws, ensuring consistent dimensions and high-quality manufacturing.
Yes, especially for M12 screws. Pre-drilling is highly recommended to prevent timber splitting.
These are M12 screws, meaning the shank diameter is 12 millimeters.
Ensure you have drilled a pilot hole of the correct diameter; without it, the high friction of an M12 screw is difficult to overcome.
Stop immediately and increase the pilot hole diameter slightly, or ensure you are not drilling too close to the edge of the timber.
Ensure the socket or spanner size is exactly matched to the screw head size and that the tool is fully seated on the head before turning.
For successful installation, always measure the thickness of the material to ensure the 150mm length provides adequate penetration without protruding dangerously from the other side. You must drill a pilot hole using a drill bit slightly smaller than the core diameter of the screw to avoid splitting the timber.
Care instructions are minimal: although they are zinc plated, avoid using these in high-salinity or permanently wet environments. Periodically check the tightness of connections in structural wood projects after the first few months, as wood may shrink or expand, which can loosen the fastener over time.
