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Reference.org
Self-tapping screw
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<p>A self-tapping screw is a <a href="/facts/Screw/Rr0k38TC">screw</a> that can <a href="/facts/Tap_and_die/RF10YLhA">tap</a> its own hole as it is driven into the material. More narrowly, self-tapping is used only to describe a specific type of thread-cutting screw intended to produce a thread in relatively soft material or sheet materials, excluding <a href="/facts/Wood_screw/Rr0k38TC">wood screws</a>. Other specific types of self-tapping screw include self-drilling screws and thread rolling screws. </p>