Thumb screws add the finishing touch to front panels or other equipment and offer the ease of no-tool assembly and disassembly for many applications. These components have easy-to-grip diamond knurl head surfaces plus a choice of materials and finishes that will complement any design. RAF thumb screws are available in washer face, plain, and push styles in American and Metric dimensions.
In Europe, from the medieval times, there were a set of tools which were approved for extracting confessions. It was a method primarily used to extract confessions as it was both painful and caused lasting damage. Used for purposes of torture in medieval times.
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The thumbscrew is a torture instrument which was first used in early modern Europe. It is a simple vicesometimes with protruding studs on the interior surfaces. Victims' thumbs, fingers, or toes were placed in the vice and slowly crushed. The thumbscrew was also applied to crush prisoners' big toes.
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Related to Thumb screws: jack screws. A screw designed so that it can be turned with the thumb and fingers. Historical Terms an instrument of torture that pinches or crushes the thumbs.
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A screw drive that comes with either a tall headed or ridged knurled sides, or a key-like flat sided vertical head can be defined as a thumb screw. These screws can easily be tightened or loosened by hand without using any external drive. However, they are not ideally used for any structural applications.