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RickW

Wood Screw vs Self Tappers

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Self tappers are fine for attaching hardware where the head secures the item to the material it's attached to.  Wood screws are designed to go through one piece of wood and secure it to another.  The shank is smooth without threads so it will go through the outside wood and allows the root diameter (threaded portion) to screw into the base bringing the top wood in tight without binding before drawing tight.  If you try to do that with a self tapper, chances are there will be a slight gap between the two because the threads are tight in both pieces of wood not allowing it to draw in tight.

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I find that self tappers work fine for wood to wood if you drill a proper clearance hole through the first piece and a pilot hole into the second.

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