Thread % for tap drill (cutting, helicoil, user-defined) and Thread % for tap drill (rolled) represent the percentage of the thread form that is cut with the tap. By default the cutting percentage is greater than the rolled percentage indicating that a greater percentage of the thread is manufactured by the cutting tap. This parameter is used in determining the size of the drill to use for cutting and rolled tapping operations. The larger the percentage, the smaller the size of the drilled hole.
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Thread % for tap drill (cutting, helicoil, user-defined)
Thread % for tap drill (rolled)