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The Unifix Coach Screws Hexagon Head DIN 571 are heavy-duty fasteners designed for professional contractors and DIY enthusiasts who require secure, high-torque connections in wood and timber construction projects. These screws offer superior holding power and structural integrity due to their robust design; however, users should be aware that pre-drilling is required to prevent timber splitting when working with denser materials.
| Colour | Silver |
|---|---|
| Model Part Number | 1426429 |
| Brand | Unifix |
Yes, it is highly recommended to pre-drill a pilot hole to prevent timber splitting and to ensure the screw enters straight.
They are suitable for sheltered or internal environments. For harsh, exposed, or coastal weather conditions, stainless steel fasteners are recommended instead.
You will need a socket set, a spanner, or a power drill with a compatible socket adapter.
DIN 571 is a German industrial standard that specifies the requirements for hexagon head wood screws, ensuring uniformity in size and thread pitch.
While they can be removed, it is generally recommended to use new screws for critical structural connections to ensure maximum holding power.
Ensure the pilot hole is correctly sized for the specific screw diameter and apply a small amount of lubricant or wax to the threads.
Stop immediately and increase the diameter of your pilot hole to allow more room for the screw shank.
Ensure your socket or spanner is the correct size and fully seated on the head before applying torque.
To achieve the best results, always select the correct pilot hole size based on the shank diameter of the screw; a pilot hole that is too small can cause the timber to split, while one that is too large will reduce the screw's holding capacity. Use a high-quality socket drive that matches the hexagon size to prevent rounding the edges of the screw head. While the bright zinc plating offers reliable protection against rust, these screws should not be used in highly corrosive environments. Store in a cool, dry place to maintain the integrity of the zinc coating.
