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Why did the tap stick?

Not a water tap, that is

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XD 35126/09/2018 20:03:29
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1326 forum posts
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Chris may not have known about the dia - pitch formula and there are a few duff tapping charts out there that seem to err towards fuller engagement ( 75 % or greater) for some reason . For most of what we do something around 60% is more than adequate and the only time i really worry about anything better than this is for head bolts in alloy castings .

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