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The Range£16.61Visit shop Unifix A2-304 Stainless Steel Coach Screws Hexagon Head Din 571 - M6 X 50 (Box Of 200) - White
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The Unifix A2-304 Stainless Steel Coach Screws are ideal for professionals and DIY enthusiasts working on heavy-duty timber constructions who require a secure, long-lasting fix. These M12 x 100 screws offer superior corrosion resistance and a robust hexagon head for efficient installation, though users should be aware that pre-drilling is essential to prevent splitting dense wood due to the screw's large diameter.
| Colour | White |
|---|---|
| Model Part Number | 1426283 |
| Brand | Unifix |
Yes, the A2-304 stainless steel offers high resistance to rust, making them suitable for many outdoor conditions, though 316 grade may be preferred for direct marine/coastal exposure.
No, a standard spanner, adjustable wrench, or a socket set is sufficient for the hexagon head.
It is strongly advised against. Pre-drilling is required for M12 coach screws to prevent splitting the timber.
Unlike standard carbon steel screws which require galvanizing, these are made from solid stainless steel, offering protection that won't flake off over time.
A2-304 stainless steel can exhibit slight magnetism, which is normal for this material type and does not affect structural integrity.
Back the screw out and check if the pilot hole is deep enough; increase the pilot hole diameter slightly if the wood is exceptionally dense.
Ensure the socket is fully seated on the hexagon head and check that the tool size is exactly compatible with the M12 specification.
You must pre-drill a pilot hole; if the wood continues to split, increase the pilot hole size slightly to reduce internal pressure.
For optimal performance, always measure the thickness of the timber to ensure the 100mm length provides sufficient penetration into the base member. Always pre-drill a pilot hole with a diameter slightly smaller than the screw shank (typically 7-9mm for an M12 screw depending on wood density) to avoid splitting the timber. While these screws are corrosion-resistant, avoid using them with incompatible metals to prevent galvanic corrosion. Keep the screws in a dry environment prior to use to ensure the white finish remains intact.
