Often used for mounting legs on tables. A hanger bolt is a headless fastener that has machine screw threads on one end and self-tapping threads on the other designed to be driven into wood or another soft substrate.
.Ideal for any project involving light gauge sheet metal, awnings, door and window frames, gutters, sheds. A self-drilling screw, or tek screw, is similar to a sheet metal screw, but it has a drill-shaped point to cut through the substrate to eliminate the need for drilling a pilot hole.