self drilling screws for roofing

A wafer head self-drilling screw, as the name suggests, is designed with a flat, thin, and round head that closely resembles a wafer. This design not only ensures a flush finish but also provides a broad surface area, distributing load evenly and reducing the chances of material splitting. The unique feature that sets it apart from conventional screws is its self-drilling capability. Equipped with a sharp point and specialized threads, these screws can penetrate through metal, wood, or plastic without the need for a pre-drilled hole, saving time and effort.

...

Secondly,the desired holding power is another important factor to consider when selecting the correct wedge, bolt, and drill size. The holding power of a fastener is determined by its diameter, length, and thread pitch. Generally speaking, larger fasteners with higher thread pitches provide greater holding power. However, it's important to ensure that the fasteners you select are appropriate for the thickness of the material being fastened. If the fasteners are too large for the material, they may not be able to penetrate the material fully, resulting in reduced holding power.

...