Screw Jacks are devices used to convert rotational motion into linear motion for a wide range of industrial applications. They are used to lift, position, support, and hold industrial loads. They have different types in relation to the application. Understanding each of the designs is foundational to selecting the suitable type for your specific applications.

  • Rotating Screw Jack(nut traveling)
  • Translating screw jack
  • Keyed screw jack for Non-Rotation
  • Clevis Ends Screw Jack

Once screw jacks’ design and application requests are understood, it is easy to incorporate them into industrial systems for packaging, maintenance lifts, material handling, space technology, etc.

Translating screw jacks are the most common types in all kinds of applications.

The main components of translating screw jack are trapezoidal/ball screw, worm shaft, worm gear, thrust-bearing load support and gearbox housing. With the rotation of the worm gear, the lifting screw moves upwards or downwards linearly. Unless a translating lifting screw is keyed, the top should be bolted to the lifting member to prevent the screw from rotating.

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Nut rotating screw jacks’ main components are trapezoidal/ball screw, worm screw, worm shaft, thrust-bearing load support, bronze lifting nut, and gearbox housing.

With the rotation of the worm gear, the lifting screw does not come up and down from the jack base,  it only makes a rotation around its axis. The bronze nut on the lifting screw moves linearly upwards or downwards.

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Keyed screw jack for Non-Rotation

keyed screw jack anti-rotation

Keyed translating screw jacks are needed when the loads don’t prevent lifting screw rotation. It used a key fixing to the jack housing and keyway milling into the length of the lifting screw, which stops the screw from rotating without the need for end pinning.

Please note the keyway in the lifting screw will cause greater than normal wear on the internal threads of the worm gear. And this design is only available for acme screw jacks, ball screw jacks don’t have this design.

The double clevis screw jacks are furnished with a clevis at both ends. One clevis is mounted on the end of the lifting screw, and the other one is welded to the bottom end of the cover pipe. They are normally used to move a load through an arc for angle title adjustments, such as tracking antennas, air dampers, hinged doors, etc.

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