Tapping and tapping screw characterized in that it comprises an elongated rod, and means at an end of said rod cooperative with a tool for rotating the screw, said rod including a penetrating end part with a first predetermined diameter having said penetrating end part having a centered tip about the longitudinal axis of the screw and comprising a terminal edge edge that intersects and is substantially perpendicular to the longitudinal axis of the stem with substantially planar and symmetrically disposed lateral surfaces on each side of said terminal edge edge that each diverge angularly outwards and each of them intersecting said shank in between the aforementioned terminal edge edge and the means for rotating the screw, the shank including a hanging part with a plurality of integral and full thread propeller passages with the larger diameter of the threads larger than that determined at the penetrating end portion, the stem including a threaded intermediate part which joins said penetrating end and the guide portions and with a diameter that progressively increases from said penetrating end portion to said suspended part, the said penetrating end portions, said intermediate portion and part of the suspension portion arranging a pair of oppositely disposed and longitudinally extending slots respectively determined by first and second side surfaces disposed substantially at right angles to each other and intermediate portions thereof. Uninterrupted shanks therebetween to facilitate opposing abutment surfaces that provide resistance to the slotted screw and ensure sufficient support surface for efficient drilling and tapping action, said first side surfaces of the slots being respectively parallel. Lines and off-center with a plane containing the longitudinal axis of the rod, said plane being equidistant from the cutting edges provided at the intersections of said first lateral surfaces of the grooves and the diverging lateral surfaces substantially flat and symmetrically disposed in the vicinity of that expressed sharpened tip, the cutting edges thus provided being arranged at an angle of less than 45º with the terminal edge edge, which facilitates a relief behind said cutting edges to ensure their aggressive exposure as they are presented to a work piece extending each of the said first surfaces of the grooves from the periphery of the rod threaded radially and beyond the aforementioned terminal edge edge, intersecting both of the flat lateral surfaces symmetrically disposed on the opposite sides of said terminal edge edge, said tip presenting said tip sharpened a small projection extending axially and centrally located including the aforementioned terminal edge, together with portions of said lateral flat surfaces on each side thereof for initial coupling and for removing material from a workpiece, and facilitating said first side surfaces of the grooves cutting edges radially outwardly from said tip part at the first predetermined diameter of the penetrating end portion of the screw, as well as the edges along the intermediate and pendant portions of the threaded rod to effect cutting a thread in the complementary opening of the previously drilled workpiece. (Machine-translation by Google Translate, not legally binding)