Mitsubishi Steel Mfg (三菱製鋼株式会社) is a company engaged in the production of special steel bars, springs, and machinery parts. It operates through four main businesses: Special Steel Bars, Springs, Formed and Fabricated Products, and Machinery. The Special Steel Bars segment offers carbon, non-heat treated, spring, high carbon chromium bearing, alloy, and other types of steel. The Springs segment provides coil springs, stabilizer bars, precision parts, leaf springs, etc. The Formed and Fabricated Products segment specializes in alloy powders, precision castings, machined metal parts, and special materials and machined products. The Machinery segment delivers forging machinery, environmental plant equipment, other industrial machinery, and steel fabrication services.