Thread Rolling

Thread Rolling

The high-pressure process physically changes the properties of rolled metal parts to make the base part and the threads harder and stronger. 

The tooth form of the hardened steel dies protrudes into the outside diameter of plain cylindrical blanks to reform the surface. Each tooth exudes extreme pressure against the workpiece's surface, pushing the blank material outward toward the crests in the thread roll profiles, thus producing a part with a thread mirroring that of the die. That displaced metal in the crests forms the threads.