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| Extractor (screws) ： ウィキペディア英語版 |
Screw extractor
A screw extractor is a tool used expressly for removing broken or seized screws. There are two types; one has a spiral flute structure, which is commonly known by the trademarked name Easy Out; the other has a straight flute structure. The tools are made of very hard, brittle steel; they can break off inside the screw if too much torque is applied, making the removal much more difficult.
==Spiral fluted extractor==
A spiral screw extractor is itself a coarse-pitched tapered screw thread. They are left-handed, for use on right-handed threads.
The screw is first drilled out to the proper diameter for that extractor. The extractor is then inserted into this hole and turned counter-clockwise using a tap wrench. As the extractor is turned, the flutes on the tool dig into the screw, causing it to lock tightly and apply sufficient torque to remove the screw.〔
A drawback to tapered screw extractors is that their wedge action tends to expand the drilled, and thus weakened, screw. This wedging action can lock the screw even more tightly in place, making it difficult or impossible to extract.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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