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Screw extractors are often called easyouts, these can be used to remove a broken bolt or a broken stud from a tapped hole. Here we demonstrate how to use the screw extractor to remove a broken bolt from a shaft. Brought to you by https://www.ultimatehandyman.co.uk/
A fastener such as a Nut and bolt, Or washer has a series of spikes or teeth on a bearing surface which is engageable with a workpiece. The spikes or teeth can grip the workpiece to lock the fastener against relative rotation with respect to the workpiece.