Broken Stud Remover

Written by mike bailey
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Broken Stud Remover
Removing broken studs can test even an experienced mechanic. (Jupiterimages/Photos.com/Getty Images)

A broken stud can frustrate even the most experienced mechanic if he does not have the correct tools to remove it. Unskilled extraction of a broken stud can seriously damage a cylinder head or an engine block.

Function

A stud extractor, or easy-out, extends a broken stud so it can be removed using a wrench or tap holder. The extractor engages with a hole drilled into the centre of the broken stud and grips tightly as it is unscrewed, drawing the stud with it.

Types

Tapered stud removers, either straight or spiral, are common; straight cylindrical extractors, which engage uniformly with the broken part, are sometimes preferred. Sets of extractors, formed from high-strength tool steel, often include correctly sized drill bits and guides.

Cost

A professional quality set of five tapered spiral easy-outs with left-handed drills retails for about £26. A corresponding five-piece cylindrical extractor set without drills has a suggested retail price below £13. (Prices are as of February 2011.)

Considerations

It is important to drill the hole exactly in the centre of the broken stud; an off-centre hole increases the chance of damage to the head or block. Drilling sometimes loosens the seized thread, and a left-handed drill can turn the stud and remove it without an extractor.

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