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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.
Actuator used in satellite application
Actuator application
Actuator used in print application

  • Large satellite dish antenna movement (x, y, z axis)
  • Workplace table adjustments
  • Drive wheel adjustment to change conveyor flow stops
  • Conveyor lifts, diverters
  • Knife blade filter drum skimmer
  • Furnace combustion gun adjustment
  • Mechanical clutch linkage
  • Vacuum furnace lid lifters
  • Roll lifts
  • Mandrel pushers sluice gates
  • Low temperature valve operators
  • Unwind stands
  • Calender stacks
  • High voltage switch gear die set tables
  • Electron beam adjustments
  • Horizontal presses
  • Saw blade tension
  • Stage lifts for scenery changes
  • Robotics manipulator
  • Disc refiner blade adjustment
  • Blast door locks
  • Headbox unit for paper machine
  • Tooling machine bed adjustment
  • Textile, steel, rubber, plastics skewing roll adjustments
  • Pinch valve control actuation, gate and ball valve
  • Tension testing machines
  • Packaging machinery
  • Diagnostic scanners
  • Work platforms
  • Injection molding machines-head adjustment
  • Mechanical brake linkage adjustment
  • Curing processes-constant speed
  • Feed rate movement
  • Air dampers
  • Sheet Slitter
  • Angle tilt adjustments with double clevis models
  • Remote contamination lifts
  • Precision closures
  • Solar panel actuation
  • Tension adjustment of cables
  • Welding positioners
  • Centerless grinder positioner
  • Locking indexing pins
  • Batch control
  • Palletizer indexing
  • Oven lifters
  • Door openers