Abstract: A threaded fastener for securing a first material to a support comprising a tapping point at a first end and a threaded shank with multiple separate leads. An end diameter of a fastener tip is in the range of 0.210 to 0.190 inches, the tapping point starts away from an end of the tip by a range of 0.320 to 0.40 inches, and the threads are arranged on the shank to provide a range of about 16½ to 17½ threads per inch for a 5/16 inch diameter fastener and about 18½ to 19½ threads per inch for a ¼ inch diameter fastener. A second portion of the shank, distal from the tap screw point, is unthreaded, and a head at an end opposite the tap screw point has an enlarged diameter and a countersunk shape to reduce the likelihood of pull through of the fastener through said first material.

Abstract: A fastener assembly comprising a male fastener and female fastener. The male fastener includes a shaft that has a first portion with a shoulder and a second portion being threaded. The female fastener includes a shafted with a threaded bore to receive the threaded second portion of the shaft of the male fastener. At least one of the male fastener and the female fastener includes an outer surface with a machined surface and a forger surface, wherein the machined surface faces the other fastener when the two are engaged.