The Timken Company develops, manufactures, markets, and sells anti-friction bearings and assemblies, alloy steels, and mechanical power transmission systems. It operates through four segments: Mobile Industries, Process Industries, Aerospace and Defense, and Steel. The Mobile Industries segment provides bearings, mechanical power transmission components, drive- and roller-chains, augers, and related products and services to original equipment manufacturers (OEMs) and suppliers of passenger cars, light trucks, medium and heavy-duty trucks, rail cars, locomotives, and agricultural, construction, and mining equipment, as well as to automotive and heavy truck aftermarket distributors. The Process Industries segment offers bearings, mechanical power transmission components, industrial chains, and related products and services to OEMs and suppliers of power transmission, energy, and heavy industries machinery and equipment. It also serves the aftermarket through its network of industrial distributors. The Aerospace and Defense segment provides bearings, helicopter transmission systems, rotor head assemblies, turbine engine components, gears, and other precision flight-critical components for commercial and military aviation applications; and offers aftermarket services, including repair and overhaul of engines, transmissions, and fuel controls, as well as aerospace bearing repair and component reconditioning. It also manufactures precision bearings, higher-level assemblies, and sensors for manufacturers of health and positioning control equipment. The Steel segment produces approximately 450 grades of carbon and alloy steel products, including ingots, bars, and tubes in various chemistries, lengths, and finishes for the automotive, industrial, and energy sectors. The company sells its products through its sales organizations and authorized distributors worldwide. The Timken Company was founded in 1899 and is headquartered in Canton, Ohio.