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    Hello guys & gals
    I am just learning about tap & Die never done it before and would like to ask some questions before i start ,But for me its very confusing even after looking at charts online i still am not sure which size drill bit i would need so i can make M18X2.5 thread .

    And what size bar would i need in order to make a thread on that to fit the hole with new thread on from the M18X2.5 ..


    Thank you ..

    Karl
 
 
 
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