2012-12-25 16:16 Source:未知 Writer: admin
    The wood screw is a tapered thread forming screw having a gimlet point and a sharp crested, coarse pitch thread. Wood screws can be driven without the need for a pre-drilled hole, and is designed to bond wood to wood. Wood screws are usually threaded two-thirds up from the point, with the final one-third unthreaded. This threading is used to produce a mating thread when assembled into wood or other resilient materials.

    The wood screw's taper increases the screw's binding power. Its smooth shank pulls the pieces of wood together

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