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Bolt extractor tool size question

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    John Ott
    John Ott
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    When bolt extractor specs overlap should you go up or down in size?
    Example:
    8mm (5/16) bolt, broken off with no head.
    2 Snap-on bolt extractors: A 1/8 for bolt sizes 1/4 to “5/16” which requires a 9/64 drill bit and another extractor, 9/64 for bolt sizes “5/16” to 3/8 which requires an 11/64 drill bit.
    My thoughts are that the slightly bigger extractor may have less chance to break/snap-off, but it requires a larger hole which weakens the sides of the bolt more. This in turn may cause the bolt to bind as the extractor pushes or expands against it. I need about 20-25 foot pounds of torque to free the bolt. I’m probably over thinking this since these tolerances are so close to each other, but I could really use someone with experience on this procedure to give me some feed back.

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