Patent ID: 9709086
Date: 2017-07-18
CPC Classifications: F16B

Claim:
1. A self-drilling, self-cleaning fastener comprising: a head having a top side and an underside, the head having diameter; a shank depending from an underside of the head, the shank having a diameter less than the diameter of the head; a knurled region adjacent the shank, the knurled region having a diameter, the knurled region having a plurality or spiral formed knurls therein having a twist in a first direction, the knurled region having a major circumference as measured around peaks of the knurls; a threaded region adjacent the knurled region, the threaded region having a diameter less than the diameter of the knurled region, the threaded region having a thread formed therein having a twist in a second direction opposite the first direction; and a self-drilling driving point at an end opposite the head, wherein a first portion of the fastener from the driving point to a location along the threads is formed from a first material and wherein a second portion of the fastener from an end of the first portion to the head is formed from a second material.