Skip to Content

Machine Screw Jack

Standard model capacities from 1/4 ton to 100 tons. Metric capacities from 5 kN to 200 kN.

The Inch and Metric Worm Gear Machine Screw Jacks incorporate an alloy or stainless steel worm which drives a high strength bronze worm gear (drive sleeve). The worm shaft is supported on anti-friction tapered roller bearings with external seals provided to prevent loss of lubrication. The drive sleeve is supported on anti-friction tapered roller or ball thrust bearings. 

Performance

  • Low noise (no rolling components)
  • Ideal for vertical and light loads
  • Pre-loaded nut assembly reduces backlash
  • Safe for static loads
  • Lower cost
  • Use individually or in multiple screw jack arrangements
  • Premium finishes including Epoxy, Outdoor, Marine, or per customer specification.

Durability

  • No "standard" travel lengths (built to specification). 
  • Ductile iron housings proportioned to support the rated capacity of the unit. 
  • Alloy steel worm drive with high strength bronze worm gear (drive sleeve).
  • Anti-friction tapered roller bearings with external seals to prevent loss of lubrication.
  • The drive sleeve is supported on anti-friction tapered roller or ball thrust bearings.

Screw Jack Engineering Resources

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

Screw Jack Product Selector

Easily design your own machine screw jack system based on your unique application with the DESIGN GUIDE PRO tool. Enter your parameters to determine the best product fit.

Inch Machine Screw Jacks

The jack housing is made of ductile iron and proportioned to support the rated capacity of the unit. The lifting screw is made of alloy steel with a minimum tensile strength of 95,000 psi.

  • Precision formed threads, typically using Class 2-C (Centralizing) tolerances.
  • Jack lift shaft lead tolerance is approximately ±0.004" per foot. 
  • 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

Stainless Steel Machine Screw Jacks

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.

Part Number Reference

Metric Machine Screw Jacks

The threads are precision formed, typically using Class 2-C (Centralizing) tolerances. Jack lift shaft lead tolerance is approximately ±0.004" per foot. Worm Gear 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

Machine Screw Jack Accessories

Configure a Complete Lifting System

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...

 

 

 

 

 

 

 

 

Specialty Coatings for Demanding Environments

  • Excessive Heat and Humidity
  • Extreme Cold and Ice
  • Water
  • Dust and Dirt
  • Food Handling
  • Corrosion