HSI Corporation is a manufacturer specializing in custom hydraulic cylinders since 1976. They offer a range of cylinder manufacturing services including telescopic, 2-stage, 3-stage, 4-stage, and 5-stage cylinders, as well as long stroke, large bore, heavy load, high pressure, welded, and mill type cylinders. Additionally, HSI provides cylinder repair, material sales, and seals, serving industries such as marine, drilling rig, mining, baler, steel mill, testing equipment, construction/industrial, and hydraulic systems. HSI is experienced in building cylinders to specifications of various agencies and is committed to providing individualized service while maintaining professional engineering standards.