| 摘要 |
<p>A self-tapping screw has a cutting slot (12) and at least one evacuation slot (14, 16, 18). The cutting slot (12) is formed in an acting portion (10), and has a chip evacuation surface (121) being tilted relative the center axis (4) of the shank (1) and a arced cutting surface (122) connected with the chip evacuation surface (121) to form a V-shaped section, upwardly extending from the tip of the tapered cone (11), and having a blade portion (13) formed by a portion of the arced cutting surface (122) intersecting with the periphery of a shank (1) and a threaded portion (3). The at least one evacuation slot (14, 16, 18) facilitates evacuation of chips generated when the self-tapping screw is drilled into a work piece. Accordingly, the self-tapping screw enhances the drilling, tapping and chip-evacuating capability.</p> |
