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SCREW JACK Duff-Norton line of screw jacks (mechanical actuators) includes mechanical actuators (machine screw and ball screw) ranging in size from 1/4 ton to 350 tons, stainless steel machine screw actuators, micro-miniature actuators, high duty cycle actuators, motorized machine screw and ball screw actuators, electric cylinders and motor control systems. Accessories include miter gear boxes, c-face motor adapters, limit switches, transducers, visual and digital position indicators, couplings, ball screws and ball screw systems, and locking rings. Screw Jacks are also used for raising and lowering maintenance platforms, opening and closing air dampers, oven doors and sluice gates, and adjusting tooling machine beds, cable tension and workplace tables. In addition to the broad range of applications and industries for mechanical actuators, they are also used as alternatives to hydraulic and pneumatic systems.

Duff-Norton Metric Actuators are manufactured to the same high quality standards and include all of the same features and benefits as the standard line of actuators while incorporating the following features:

  • Load Capacities in Tonnes
  • Mounting Dimensions in millimeters
  • Metric screw diameters with trapezoidal threads (machine screw actuators)
  • Metric shaft and keyway sizes per ISO recommended standards
  • All metric fasteners on machine screw units
  • Metric bolt centers
  • Other sizes and models available, contact Duff-Norton for more information