TP-25 is a type of fastener used for mechanically joining two objects together. It consists of two parts, a top and a bottom, both made from steel. The top part features a serrated or knurled section that provides grip when installed. The bottom part is threaded and comes in two sizes, an external thread and a smaller, internal one. The parts are held together by a nut that is tightened with a socket wrench or similar tool. TP-25 fasteners are typically used in applications requiring high strength and corrosion resistance, such as construction, electrical, plumbing and aerospace.