Diall T30 Pan Head Steel Concrete Screw - (Dia)7.5mm - (L)152mm

The primary advantage is their non-expansion design, which allows for secure fixings closer to edges of masonry without stressing the substrate, and they enable direct fixing without traditional frame fixings.

No, these screws are specifically designed for use in concrete and masonry substrates. They are not suitable for plasterboard or untreated wood.

You should use a drill bit with the same diameter as the screw, which is 7.5mm for this product. The depth of the hole should be slightly more than the intended embedment depth of the screw.

A T30 driver bit is required to install these screws.

While the screws are made of steel, it is recommended to ensure proper sealing of the surrounding masonry and any exposed parts for long-term durability, especially in corrosive environments.

These are designed as a permanent fixing. While removal is possible, the screw threads may be damaged during removal, and the pilot hole may be compromised, making re-use difficult and potentially less secure.

For optimal holding power, aim for an embedment depth of at least 100mm into the solid masonry substrate. Always consult manufacturer guidelines for specific applications.

The pilot hole may be too large or not deep enough. Re-drill the hole to the correct diameter and depth, ensuring it is clean of debris.

Ensure you are using a T30 driver bit that is in good condition and properly seated in the screw head. Reduce driving torque if using an impact driver and ensure the drill is set to the correct speed.

The substrate may be harder than anticipated, or the pilot hole may be partially blocked. Ensure the drill bit is sharp and suitable for masonry. Clear any debris from the pilot hole.

Verify that the correct pilot hole size was used and that the screw is fully embedded. Check for any damage to the frame or substrate that might prevent a secure fit.