Timco Self-Drilling Screws - Hex - Exterior Silver - 5.5 x 25

These screws are designed for light section steel up to a maximum thickness of 5.0mm.

No, these are self-drilling screws, meaning their special tip drills its own hole and creates threads in light steel without the need for pre-drilling.

The exterior silver plating provides reliable and durable corrosion resistance, tested to withstand over 1,000 hours in salt-spray conditions.

This specific screw has a thread diameter of 5.5mm and a length of 25mm.

They are made from case and core hardened carbon steel for strength and durability.

The fire classification for these screws is A1, which is the highest standard for reaction to fire.

This product is supplied in a pack containing 200 pieces.

Ensure the steel thickness is within the 5.0mm limit. Check if the drill bit is worn or if the drill speed/torque is insufficient. Verify the screw is properly seated against the material.

Use the correct size hex bit and ensure it is fully engaged with the screw head. Reduce excessive speed or torque if the material is thin. Ensure the screw is driven straight.

Check that the screw has fully penetrated the steel substrate and engaged the threads. Ensure the steel substrate is not damaged or weakened. Verify the screw is the correct type and length for the combined material thickness.

While plated for durability, prolonged exposure to harsh chemicals or highly corrosive environments may eventually affect the finish. Ensure storage is dry and inspect fixings periodically.