The threads are designed to allow the dust to be removed and to prevent interference with the screw installation. As the threads are cutting into the masonry, dust is created.
The lead thread will dull and hit a point where it will no longer be able to cut threads and will stop screw penetration. The abrasiveness of the masonry will determine the exact depth that any specific screw can tap. When tapping threads into masonry, the lead thread does all of the cutting of the masonry material and isĭesigned to cut threads up to 1-3/4” in depth. A self-tapping screw does not drill a hole and tap threads, which would be. A self-tapping screw is a screw that taps its own threads when screwed into a hole.
