US Patent 7883307 Self-drilling fastener

A self-drilling fastener from which objects may be hung, for use in a friable material with or without an underlying member at the point of use or in a semi-rigid material such as a hollow core door comprises an elongated body having a threaded exterior with separate threads for drilling into the member, gripping the member, gripping the friable material and/or gripping the semi-rigid material. The fastener may further have a thread having a relatively small-diametered solid portion from which objects hang and an axially expanding angled portion for biasing the object toward the solid portion to stabilize and prevent the object from dislodging from the fastener.