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Self-tapping screws are designed to cut and tap their own threads into materials such as metal, wood, or plastic as they are driven into place, ensuring a tight and secure fit.
Yes, most standard self-tapping screws require a pre-drilled pilot hole that is slightly smaller than the outer diameter of the screw threads to allow proper thread creation.
Galvanized self-tapping screws undergo a zinc-coating process, which provides superior corrosion resistance, making them ideal for outdoor installations and humid environments.
The rubber (EPDM) washer under the head of the screw compresses during installation to create a watertight seal, preventing leakage and protecting against thermal expansion on metal roofs.
While they can be reused, doing so in the same hole may reduce their holding power, as the threads cut during the initial installation may become worn or stripped.
