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Image: Internal and External Thread

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Internal_and_External_Thread.jpg(660 × 559 pixels, file size: 185 KB, MIME type: image/jpeg)

Description: Internal and external threads illustrated using a common nut and bolt. The screw and nut pair can be used to convert torque into linear force. As the screw (or bolt) is rotated, the screw moves along its axis through the fixed nut, or the non-rotating nut moves along the lead-screw.
Title: Internal and External Thread
Author: William Rafti of the William Rafti Institute
Usage Terms: Creative Commons Attribution 2.5
License: CC BY 2.5
License Link: http://creativecommons.org/licenses/by/2.5
Attribution Required?: Yes

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