Hybrid threading tap with reamer portion and thread cutting portion

A hybrid threading tap that defines a longitudinal axis, the hybrid threading tap configured to expand and thread a hole in a part, the hybrid threading tap comprising:

• a reamer portion with a leading end, a trailing end, a first junction end spaced apart along the longitudinal axis from the leading end, and an outer radial surface with respect to the longitudinal axis, the leading end sized to advance into the hole for abutment of the outer radial surface against an inner radial surface of the hole, wherein the leading end has a leading width, wherein the trailing end has a trailing width;
• wherein the trailing width is, at most, two percent (2%) larger than the leading width;
• and a thread cutting portion having a second junction end that is attached end-to-end to the first junction end at a junction, the thread cutting portion having a plurality of cutting teeth, the thread cutting portion arranged with the reamer portion along the longitudinal axis, the plurality of cutting teeth arranged in a first land and a second land with a chip opening separating the first land and the second land in a circumferential direction about the longitudinal axis, the chip opening extending along the longitudinal axis through the thread cutting portion;
• the reamer portion configured for the leading end to enter into the hole and for the outer radial surface to advance into the hole to plastically deform and expand the hole to an expanded hole and provide the expanded hole with a zone of residual compressive stress;
• and the plurality of cutting teeth configured to cut a threading into the expanded hole within the zone, the chip opening configured to receive chips during cutting of the threading into the expanded hole;
• and the reamer portion and the thread cutting portion having different material characteristics that are different at the junction.