Self-tapping fasteners: The facts on this cleverly ...
2018-8-28u2002·u2002Self-tapping screws tap their own thread, which means they require a pilot hole which is slightly smaller than the diameter of the screw. They work on the premise that if you drill a pilot hole into a soft material like wood, as you drive the tapping screw in, its threads will make the material secure by digging its way into it.
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