Abstract: A rotary metal cutting tool for forming threads on the insides of a bore, drilling a bore or otherwise shaping a bore, which tool is fabricated from a metal injection molded blank of appropriate tool steel to provide improved tool wear. The tool, which may be a tap, includes a transverse stress relief ring for reliably localizing the point of tool failure under overstress conditions. A polygonal, e.g., hex, surface on the shank provides means for engaging the shank with an extraction tool to remove the broken remains of the tool from the bore after the tool fails. A conventional O-ring seal is installed in the stress relief ring to provide protection from flying metal particles upon failure.