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Stainless Steel Machine Screw Jack

Standard model capacities from 2/3 Ton to 12 Ton.

ActionJac™ Stainless Steel Machine Screw Jacks are ideal for use in demanding environments where corrosion resistance is required. All external components are manufactured from 300 series Stainless Steel materials. These jacks use a stainless steel worm with a high strength bronze drive sleeve. Load capacities for Stainless Steel Machine Screw Jacks range from 1,300 to 23,000 pounds. A 17-4PH hardened worm is available for a 300% increase in capacity. 

Screw Jack Engineering Calculators, Engineering Tools, & Technical Information. A comprehensive library of helpful screw jack resources.

Use this handy engineering tool to determine the right screw jack solution based on the parameters of your specific application.

  Collaborate with a linear motion experts regarding your application for the ideal solution that best meets your performance requirements and budget.


A lift shaft moves through the gear box and extends out from the top or bottom. Integrated nut and worm gear for synchronized rotation. When the lift shaft is held to prevent rotation, it moves linearly through the gear box to move the load. Learn More


A lift shaft moves a nut as it turns and is fixed to the worm gear and extends out the bottom or top of the jack. The load (attached to travel nut), moves along the lift shaft. Learn More

Inch Stainless Screw Jacks

The drive sleeve is supported on anti-friction tapered roller or ball thrust bearings. Rotation of the drive sleeve causes the acme thread lifting screw to translate or rotate, depending upon jack configuration. The threads are precision formed, typically using Class 2-C (Centralizing) tolerances. Jack lift shaft lead tolerance is approximately ±0.004" per foot.

Machine Screw Jacks having gear rations between 20:1 and 32:1 are self-locking and will hold loads without backdriving in the absence of vibrations. All other ratios may require a brake to prevent backdriving.

Part Number Reference

Screw Jack Accessories

Nook Industries offers a wide assortment of screw jack accessories to accommodate specific applications. From motor mounts to limit switches to lubricant, Nook can easily configure a complete screw jack system.

Start with a base screw jack and add accessories to configure a complete linear motion system. Some accessories include:

Hardware Power Sensing & Control
  • Line Shafting
  • Gear Boxes
  • Couplings
  • Bellow Boots
  • Support Bearings
  • Motor Mounts
  • RA Reducers
  • AC Motors
  • Stepper/Servo Motors
  • Handwheels
  • Sensors
  • Limit Switches
  • Counters
  • Encoders
  • Control Panels

And many more...