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Homebase£1.99Visit shop Hiatt Hardware Hiatt 8 X 1.1/4 Inch Countersunk Hard Twin Posi Zinc Plated Screws
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Designed for professional tradespeople and home DIY enthusiasts, Hiatt Hardware Countersunk Hard Twin Posi Screws are engineered to provide superior driving force and reliable performance in dense materials like hardwood. While these screws offer excellent starting ease and corrosion resistance thanks to their zinc plating, they are specifically optimized for hard timbers, meaning they may be overkill for lightweight or soft substrates.
| Brand | Hiatt Hardware |
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The zinc plating provides corrosion resistance suitable for many outdoor applications, but they should be avoided in harsh coastal areas where stainless steel is preferred.
These are designed for ease of starting, but for hardwoods or near-edge applications, pre-drilling is always recommended to prevent wood fibers from splitting.
These require a Posi-drive (PZ) bit, which is distinct from a standard Phillips (PH) head.
Yes, due to the steel core, these screws will be attracted to magnetic bit holders, which makes them easier to handle.
Yes, they perform excellently in softwoods, though they are specifically engineered to tackle the resistance found in harder timber types.
Ensure you are using a genuine Posi-drive bit, not a standard Phillips bit, as the shapes differ significantly.
While these screws start easily, always pre-drill a pilot hole if working close to the end grain of the wood.
Back the screw out completely, clear any wood dust from the hole, and check that the torque setting on your driver is sufficiently high.
To ensure optimal performance, use a correctly sized Posi driver bit. Ensure your drill is set to a moderate speed to prevent overheating the screw head, which can wear down the Posi recess. These screws are fully compatible with standard hardwoods. For care, store in a dry location to maintain the integrity of the zinc plating. If the screw head is exposed to moisture, a light wipe-down can prevent long-term discoloration.
