| 摘要 |
A self-drilling screw includes a thread section, a head on the thread section, and a drilling section. The thread section has plural threads. The drilling section includes two opposite cutting edges with an end point for cutting a hole in a workpiece, a discharging section for exhausting bits cut by the drilling section, a guiding section formed above the discharging section to lead the screw to vertically move in the workpiece, and two discharging grooves to lead cut bits to temporarily stay in the discharging section. When the screw is rotated to move in a workpiece, the cutting edges can drill a hole, with cut bits moving into the discharge section and exhausted out through the discharging grooves. After the screw moves into the workpiece for a certain depth, the guiding section can guide the screw to move straight and accurately in the workpiece.
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