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Self-Locking Screw

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.

Frictional Forces on Screws

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...

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Related Experiment Video

Updated: Apr 23, 2026

A Spine Robotic-Assisted Navigation System for Pedicle Screw Placement

A Spine Robotic-Assisted Navigation System for Pedicle Screw Placement

Published on: May 11, 2020

Are pedicle screws dangerous?

Jeremy L Fogelson¹, William E Krauss¹

¹Department of Neurological Surgery, Mayo Medical School, Mayo Clinic, Rochester, Minnesota, USA.

World Neurosurgery

|September 21, 2014

Summary

No abstract available in PubMed .

Keywords:

Accuracy Lumbar spine Pedicle screw Screw misplacement Spinal fusion Thoracic spine

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