FPL Research Patented

A patent titled “Method and Apparatus for Determining the Surface Area of a Threaded Fastener” was recently awarded to FPL researchers Douglas Rammer and Samuel Zelinka.  The invention is a method for reliably determining the surface areas of threaded fasteners, such as wood screws, drywall screws, or threaded nails.

The method entails acquiring an image of the fastener, separating the image into three regions (thread region, root region, and body surface), determining the surface area of each region, and summing them. The ability to determine this measurement is important for several applications, including studying the corrosion rate of fasteners.