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  1. griffdo

    Metric hole tapping

    I have a threaded shaft, .2770 O.D. The threads appear to be metric with 6.5 mm threads (measured with a metric thread gauge). Question: What size drill for the hole do I use and what size tap do I use? Looking at a drill chart, would I use a "B" drill (.238) and a M7 X 1 tap as the...

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