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Machine Design

Screw and nut systems -- Duff-Norton Co.

 Tight-tolerance Acme and ball-screw and nuts feature minimal backlash. They are manufactured of bronze, plastic, and steel for high-wear resistance, and have manganese-phosphate-coated ball screws. Screw diameters are ½ to 9 in.
Duff-Norton Co., Box 7010, Charlotte, NC 28241, (800) 477-5002,

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