High-speed forming tap

aecdA high-speed forming tap for cutting and forming a female screw by cutting edges (E) of a screw portion fed in synchronous with the rotation of a machine tool. The high-speed forming tap is characterized in that chamfers (CF) are provided at a bevel lead of the screw part. The chamfers (CF) start from the cutting edge (E) and are provided along ridgelines (R) between a crest face and flanks, or a following flank and a leading flank. This structure enables the shape of the edges of the tap leading portion to be stably maintained and high-speed, smooth female screw cutting with high accuracy, and provides a tap with long life.