Patent ID: 6923611

Claim:
A self-drilling fastener for attaching wood substrates to metal substrates comprising: an elongate shank defining an axis and having a first end and a second end; a drilling tip at the first end of the shank, the drilling tip having a drill point and an axial length; a broad head formed at the second end of the shank; wherein the shank has a threaded portion axially extending from the drilling tip towards the head, the threaded portion having helical threads, an axial length of between about 0.35 inches and about 0.5 inches, a root diameter and a thread diameter, the thread diameter being greater than the root diameter, the length of the threaded portion being greater than the length of the drilling tip; and wherein the shank has an unthreaded portion axially extending from the threaded portion to the head, the unthreaded portion having an axial length of between about 1.25 inches and about 1.5 inches and a diameter, the diameter of the unthreaded portion being smaller than the thread diameter.