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A self-drilling screw is a type of fastener designed with a drill-point tip that can drill its own pilot hole and establish mating threads in one continuous operation, saving installation time.
While self-tapping screws cut or form threads, they require a pre-drilled hole. Self-drilling screws possess a drill-bit point that eliminates the need for pre-drilling entirely.
Yes, they are specifically designed to drill through steel and other metals. The maximum thickness they can drill depends on the screw's point size (typically ranging from #1 to #5).
Generally, self-drilling screws should not be reused for metal drilling, as the drill tip loses its sharpness and structural integrity after the initial cut. Using a new screw ensures reliable fastening.
Common options include hex washer heads for high torque application, countersunk (flat) heads for a flush surface finish, and pan or round heads for decorative and low-profile needs.
