| 摘要 |
A drill screw having a drilling section with a thread form thereon in which truncated thread crests taper inwardly and thread roots taper outwardly as they progress in the direction of the tip. The drilling section further includes a flute having a chip deflecting surface to facilitate metal removal during installation. The screw preferably has machine threads which extend to portions of the drilling section which are adjacent to the flutes. Because of the position and configuration of the threads, the screw of the present invention is particularly adapted for use with hard supports. |
