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Machine Screw Jack

Machine Screw Jacks - 1/4 Ton to 100 Ton & 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. Rotation of the drive sleeve causes the acme thread lifting screw to translate or rotate, depending upon jack configuration.

Available Finishes: Standard Nook Epoxy, Nook Outdoor, Nook Marine (Can also paint to customer specification).

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Engineering Resources

Inch Machine Screw Jacks

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.

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.

Depending on size, Upright Translating designs are available with optional accessories such as boots, motor mounts, right-angle reducers, motors, encoders and rotary limit switches.

TRANSLATING SCREW JACK

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.

ROTATING SCREW JACK

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.

DOUBLE CLEVIS SCREW JACK

Moves a load through an arc, such as tracking antennas, hinged doors or air dampers. One clevis is mounted on the end of the lift shaft and the other clevis is welded to a heavy duty stem cover, which is welded to the housing.

KEYED SCREW JACK

Prevents rotation of the lift shaft with a square guide attached to the screw translating inside a square stem cover. The square stem tube is supplied with lube fittings. A lift shaft moves through the gear box and extends out from the top or bottom. An integrated nut and worm gear rotate together. When the lift shaft is held to prevent rotation, it moves linearly through the gear box to move the load.

ANTI-BACKLASH SCREW JACK

Used wherever reversible load conditions require precision positioning control. Adjustable backlash Machine Screw Jack models are available to reduce backlash to approximately 0.003".

 

Stainless Steel Machine Screw Jacks

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.

 

Metric Machine Screw Jacks

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.

Depending on size, Upright Translating designs are available with optional accessories such as boots, motor mounts, right-angle reducers, motors, encoders and rotary limit switches.

Related Machine Screw Jack Products

 

 

Machine Screw Jack Accessories

Nook Industries offers many machine screw jack accessories to accommodate specific applications. From motor mounts to limit switches to lubricant, Nook has the machine screw jack accessories to realize the linear motion needs of any application.

Start with a base machine screw jack and add accessories to configure a complete screw jack 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...

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