Precision machining services. Since 1916, Hahn Manufacturing has been providing prototype and production large part machining, such as boring, milling, drilling, tapping, and grinding on ferrous and non-ferrous material. It is one of the trusted suppliers of Fortune 500 quality custom critical precision original equipment manufacturer (OEM) components. Some of the industries served by Hahn Manufacturing include power generating, transportation, machine tool, paperboard, energy, packaging, plastic injection molding, mining, printing, material handling, medical, gas transmission, food, gear reduction, construction and air compression. Hahn Manufacturing is centrally located in Cleveland, Ohio.