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NICE that you showed the formula :-)

Posted By: Willbird devotee of boutique ammunition
Date: 7/7/20 02:28

In Response To: Yep. F drill = .257" (CML)

Sure we can all go to a tap and die chart, but that does not help the feller who has a 1-3/4-18 thread to deal with :-). Helps us with Metric too, an M6x1.0 thread will use a 5mm tap drill.

The average person might have to use a 17/64 .2656", but I'd encourage care to see that it does not drill big for all of the reasons a drill can cut oversize.

I'd rather see a 50% thread than a broken tap from trying to use .250 and cutting a 100% thread. The tap drill chart gives us roughly 80% threads.

5/8-18 is kind of a bitch because neither of the avail sizes actually gives 80%....in one past job 5/8-18 gave us a lot of problems producing threads good to gauge.

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