Abstract: A blind fastener having an internally threaded sleeve with a head at one end and a taper at the other. A mandrel is threaded into and through the sleeve, and has a head that bears against a collar which it pushes onto the tapered end of the sleeve. A nut is threaded onto the mandrel to be turned against the head of the sleeve. In turn, the nut is restrained against rotation by a torque tool, and the mandrel is engaged by the tool to turn them counter-rotatively to set the fastener. The nut has a face that faces toward the head of the sleeve that is adapted to make at least a partially conforming engagement with recesses in the head of the sleeve.

Abstract: A metallic balanced pin for a shear flow joint, and a fastener and joint including the pin. The pin has a head, a cylindrical shank and a reduced neck. The neck includes a peripheral groove, a helical thread being an example. The inherent strengths of the head and groove are substantially equal and only sufficient to resist axial tensile forces exerted by bending in a shear flow joint. The inherent strength of the shank section is sufficient to resist shear forces in the joint. Preferably the intersection of the neck and a transition section connected to the shank section is locally work-hardened to resist fatigue forces.

Abstract: A two-piece rivet assembly comprising a shank member and a collar. The shank member includes a head, a cylindrical shank, and a helical thread with a substantially constant pitch, but with a crest diameter which decreases as it extends away from a maximum adjacent to its end farthest from the shank. The ring-like collar has an inner wall, an outer wall, and a first and a second end. The inner wall defines a passage between the ends to receive at least a portion of the thread. With the shank placed in an aperture in a workpiece with at least a portion of the thread projecting beyond a surface of the workpiece, the collar is placed over the thread and a swaging setting force is applied. This force applies both axial and radial components to the collar. This forces the collar against a surface of the workpiece and swages the wall into the thread at its maximum diameter and then continuously along the thread, exerting a tensile force on the shank member.