Headquartered in suburban Chicago, Plymouth Tube Company, is a privately held international steel tube manufacturer established in 1924. Presently, Plymouth operates a large network of metalworking mills in the United Sta......Headquartered in suburban Chicago, Plymouth Tube Company, is a privately held international steel tube manufacturer established in 1924. Presently, Plymouth operates a large network of metalworking mills in the United States fostering continued growth in the aerospace, transportation, energy, industrial and other major markets. Plymouth is a global supplier of specialty tubing in carbon steel, alloy steel, stainless steel and nickel alloy for mechanical, pressure, boiler, performance racing and hydraulic applications. Plymouth Engineered Shapes a member of the Plymouth Tube Company, manufactures near-net extruded shapes in carbon steel, alloy steel, stainless steel, nickel based alloy and titanium. Markets served include Aerospace, Firearms, Valves, Elevator Sills and much more!