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  Four main reasons:

  • Oversize core diameters (tapping drill diameter) produce truncated threads resulting in insufficient thread engagement with the male component.

  • Undersize cores produce torn threads and an oversize effective diameter, occasionally to the extent where they will not fit the male component at all.

  • Undersize cores encourage tap breakage.

  • Significantly undersize cores prevent the tap starting so cannot be tapped.

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