C1022A Flat Head Self-Drilling Screws with Underhead Nibs

These are known as reaming wings or clip ears. Their job is to drill a clearance hole in the wood or composite board that is slightly larger than the screw's threads. This prevents the wood from climbing the threads and cracking during installation. Once the wings hit the metal substrate, they snap off automatically, allowing the threads to bite into the steel for a secure hold.

No. These are true self-drilling fasteners. The precision-ground drill point (available in #3 or #5) is designed to act as a drill bit, penetrating both the timber and the metal beam in one continuous motion. This eliminates the need for separate drill bits and reduces labor time by up to 50%.

These are self-countersinking nibs (scraping ribs). They act like mini-cutters that clear out a clean, concave indentation in the wood as the head seats. This ensures a perfectly flush finish with the surface, removing the need for a manual countersink bit and preventing wood splintering.

This depends on the point size. Our standard #3 point is suitable for steel up to 4.5mm thickness, while our heavy-duty #5 spiral point can penetrate structural steel up to 12.5mm (1/2'). Always specify your substrate thickness when ordering to ensure the correct point selection.

For standard indoor use, we offer high-quality Blue-White Zinc plating. For outdoor or high-corrosion environments (C4/C5 zones), we recommend our Ruspert or Zinc-Nickel coatings, which are tested to withstand 1,000 to 2,000 hours of salt spray without red rust.