The 1-ton-capacity ball screw actuator has a standard 23.1-percent efficiency rating and can be driven at a maximum of 1/2 horsepower. It is available with top plate, clevis, or threaded end mounts. As the horizontally mounted worm shaft is turned, sliding contact is made with a worm gear inside the actuator housing. The worm gear is attached to a ball nut fitted with recirculating steel balls, which makes translating contact with the ball screw, reducing friction to a bare minimum and converting torque to thrust, the manufacturer says. The actuators can be used individually, in tandem, or as part of a larger mechanical system. With lifts up to 20 feet, the actuators come in many standard models or can be custom designed for any application up to 50 tons.

Duff-Norton Co., P.O. Box 7010, Charlotte, NC 28241-7010; 800-477-5002;;

eProduct #188