Self-tapping screws tap their own threads but typically require a pre-drilled pilot hole. Self-drilling screws feature a tip shaped like a drill bit, allowing them to drill their own hole and tap threads in a single operation.

Yes, creating a pilot hole slightly smaller than the screw's diameter is recommended, especially when working with metals or hard plastics. This ensures proper alignment and prevents the material from splitting or cracking.

Galvanized self-tapping screws are coated with a protective layer of zinc. This coating offers excellent resistance to rust and corrosion, making them ideal for outdoor construction and high-moisture environments.

Absolutely. Hexagon head self-tapping screws are designed for heavy-duty applications. The hex head allows for higher torque transmission using a socket wrench, making them perfect for fastening metal sheets and structural framing.

Yes, they can be removed and reused, but they may not hold as securely in the same hole upon reinsertion because the threads cut into the material can wear down over time. It is best to avoid repeated reuse in critical load-bearing applications.