| 摘要 |
A self-tapping screw according to the present invention includes a head (1) and a shank (2) extending from the head. The shank includes a cylindrical shank (2a) immediately below the head and a truncated conical shank (2b) following an end of the cylindrical shank, the cylindrical shank is provided with a plurality of first external threads (3a), the truncated conical shank is provided with a plurality of second external threads (3b) following the first external threads, and a peak of each of the second external threads is provided with a biting surface (4) having a concave-convex form. |
