Fastener with drill pilot and reversed threaded regions

摘要

A fastener includes a shank having a pilot section and a threaded section. The pilot section includes a cutting tip and a drill section; the threaded section includes a first thread region having the same twist as the drill section and a reverse thread region. A helical ridge may be provided in the reverse thread region. A head at the second end includes a top portion such as a disk and an undercut region.

主权项

1. A fastener, comprising:
a shank having a first end and a second end, and having a diameter, the shank including
a pilot region beginning at the first end and including a drill section having a drill diameter formed by a surface, the surface having a flute formed in the surface, the flute forming at least one turn about a circumference of the surface along a length of the pilot region;a first thread region adjacent the pilot region having a thread with a twist direction matching a twist direction of the drill section;wherein the pilot region extends from the first end to the first thread region and has a point diameter adjacent to the first end, the drill diameter being less than the point diameter, the point diameter comprising a diameter of a bore formed by the fastener when the fastener is rotated into a substrate;a reverse thread region adjacent the first thread region, the reverse thread region having a thread having a twist opposite to the thread in the first thread region; anda head at the second end.