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Duff-Norton has been manufacturing Acme and Ball Screws and Nuts for our actuator products for decades, and is now applying those years of experience to bring you an expanded assortment of screws and nuts for your application requirements. Acme Screws & Nuts offer excellent load ratings and Centralizing class screw & nut assemblies. Ball Screws & Nuts offer excellent load ratings, 90% efficiency, and long predictable life ratings.
Control Components
(Switches, Encoders, etc.)



Control Components: Actuator control system
Duff-Norton offers constant speed AC Motor Control Systems for acme and ball screw systems. These new control systems provide the option of jogging-inching, or maintained operation, when specified as part of a Duff-Norton Linear Positioning System. Numerous options are available including short circuit protection, pilot lamps, illuminated push buttons, and loose limit switches, as well as single and three phase power up to 575 VAC. Contact Duff-Norton for all your special control applications needs. Duff-Norton can be your single source for complete linear positioning systems. For more information plus specifications and dimensions please download our PDF using the link above.


Control Components: Rotary limit switches
Rotary limit switches can be used in applications where there is a need to control equipment that rotates and/or reverses. The NZ6000 series switch is appropriate for most applications and is mounted in-line to the screw. The SKA6000 series switch is required only for long screws with fine pitches (more than 244 turns) and has a right angle gear reduction. SKA6000 series switches are readily adaptable to End Block sizes EB0003S - EB0006S, and require custom adapters for other block sizes. For more information plus specifications and dimensions please download the "Control Components" PDF using the link above.


Control Components: Potentiometer, transducer
The Duff-Norton SKA6200T Series Position Feedback Potentiometer/Transducer is designed to mount on the end of any SKA6000T limit switch. Its active component is a precision potentiometer which may be used as voltage divider to provide a feedback voltage that is proportional to actuator position. For more information plus specifications and dimensions please download the "Control Components" PDF using the link above.


Control Components: Ring kit encoder
The Ring Kit Encoder counts motor revolutions and is mounted between the C-face motor and motor mounting flange. With 60 pulses per motor revolution, the ring kit offers a high pulse count relative to actuator travel. A small junction box with NPT opening is attached to the ring, allowing easy, protected electrical connections. Available for all sizes of NEMA C flanges used on Duff-Norton motorized screw and nut systems. Additional output types available. Contact Duff-Norton Application Engineering for specifics.


Control Components: Stop nuts
Modern day controls, limit switches, and encoder are highly sophisticated. However, those controls are not always fool proof  particularly during prototype system development stages. In such cases, Duff-Norton highly recommends the use of stop nuts. In either horizontal or vertical applications where a positive mechanical stop may be desired; the Duff-Norton stop nut is up to the task and will prevent the system from over running its limits. Stop nuts should only be used as a last resort as jamming the acme or ball nut can damage the entire system. For more information please download the "Control Components" PDF using the link above.


Control Components: Safety nuts
The Duff-Norton safety nut is highly recommended for vertical applications where the load must be maintained. The safety nut is pinned to the acme or ball nut and can be supplied with either a mounted proximity switch or mechanical switch. For more information please download the "Control Components" PDF using the link above.


Control Components: Rotary counter
The Duff-Norton Rotary Counter is for actuator customers who are looking for a more economical and easy way to determine an actuator's position. Our counters have been design to match our most common actuator ratios. An operator viewing the reading in the display window will know his actuator's exact position because the counter's display shows stroke to the nearest 1000ths of an inch up to 99 inches of travel. Custom numeric displays are also available. For more information please download the "Control Components" PDF using the link above.