Fastener with drill pilot and reversed threaded regions

摘要

A fastener includes a shank (100) having a pilot section (110) and a threaded section (113). The pilot section includes a cutting tip (111) and a drill section (112); the threaded section includes a first thread region (113) having the same twist as the drill section and a reverse thread region (114). A helical ridge (115) may be provided in the reverse thread region. A head (104) at the second end includes a top portion such as a disk and an undercut region.