| 摘要 |
<p>The present invention provides a tapping screw comprising: a head part; and a shank part including a plurality of curve sections extending in an extending direction from the head part, having a helical ridge formed on an outer circumference surface and formed in a curved shape in a circumferential direction perpendicular to the extending direction, and straight line sections arranged in adjacent curve sections among the curve sections and linearly formed in the circumferential direction, wherein the extending lines of the straight line sections are arranged to form a pentagon.</p> |
