Duff-Norton manufactures screw jacks, linear actuators, electric cylinders, rotary unions, acme and ball screws for the industrial market. Since our beginning in 1883, Duff-Norton has earned a reputation for reliable, high quality products meeting the industrial lifting, positioning, and heat transfer needs of our customers worldwide. Our time-proven Screw Jacks have been used in steel mills for years as a means for roll adjustment and forming applications. Our rotary union products are used to cool continuous casters and tunnel furnaces of all shapes and sizes. Every member of the Duff-Norton team is dedicated to customer service excellence. Made in the USA.