Wood screws are probably the most commonly-used mechanical woodworking fasteners. They are used primarily for connecting wood to wood and are known for the clamping force that they provide to strengthen a joint. Wood Screws have a coarser pitch than sheet metal or machine screws, and often have an unthreaded shank. The threadless shank allows the top piece of wood to be pulled flush against the under piece without getting caught on the threads.
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