Abstract: Helical groove fasteners and methods for producing the same are provided for use in systems requiring fluid passage through the fastener. In one embodiment, the fastener includes a shank, a head, a threaded portion, and at least one groove extending through at least a portion of the threaded portion. The fastener can include a single groove or multiple grooves. In certain preferred embodiments, the helix rotation angle of the groove is selected so that the shank has a continuous diameter to facilitate the thread forming process. In preferred embodiments, the fastener is cold forged and the threads are formed using a thread rolling die.

Abstract: Helical groove fasteners and methods for producing the same are provided for use in systems requiring fluid passage through the fastener. In one embodiment, the fastener includes a shank, a head, a threaded portion, and at least one groove extending through at least a portion of the threaded portion. The fastener can include a single groove or multiple grooves. In certain preferred embodiments, the helix rotation angle of the groove is selected so that the shank has a continuous diameter to facilitate the thread forming process. In preferred embodiments, the fastener is cold forged and the threads are formed using a thread rolling die.

Abstract: The countersink tool assembly of the present invention is rotatably driven by a conventional drill apparatus and includes an insert having a central aperture and two diametrically opposed ears which extend into the central aperture. A multi-fluted countersink tool is concentrically mounted within the aperture such that the diametrically opposed ears extend into the flutes of the countersink tool at a desired axial location. The ears are adapted to engage and follow the contour of the curved outer wall surface which concentrically surrounds the hole. As such, the countersink tool assembly translates rectilinearly with respect to corresponding changes in the curved contour of the outer wall surface.