Invention Grant
US09322422B2 Fastener with drill pilot and reversed threaded regions 有权
紧固件带钻头和反向螺纹区域

Fastener with drill pilot and reversed threaded regions
Abstract:
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.
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