OKK USA is one of the leaders in machine tool technology. It specializes in manufacturing a range of machining centers, such as five-axis, graphite and grinding. Other products include milling machines, both computer numerically controlled (CNC) and conventional, as well as die and mold making systems. OKK USA has domestic operations in Glendale Heights, Ill., and Irvine, Calif. The company is based in Japan and has facilities in France, Germany, Switzerland and Thailand. OKK USA began in 1915 as a maker of centrifugal pumps and has been making machine tools since the 1930s.