Typical specials include self-captive tapping screws and double-thread combinations. Self-captive screws combine coarse-pitch starting threads with a finer pitch farther along the screw shank.
Self-tapping screws are usually drilled into pre-made holes (pilot holes) in metals, such as zinc, aluminum, and bronze and its alloys, as well as plastics and resin-impregnated plywood. They create ...
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