Balanced pin for shear flow joint, and joint including the pin

A metallic balanced shear flow pin having a first and a second end and a central axis, said fastener comprising a head section, a cylindrical shank section, a transition section, a neck section, and a peripheral groove on said neck section, said sections being coaxial with one another, and provided in the order recited from said first end, said head section and peripheral groove having respective inherent strengths to resist axial tensile forces, and said cylindrical shank section having a respective inherent strength to resist lateral shear forces, said cylindrical shank section having a diameter, and said head and neck sections having respective lateral dimensions, said diameter being smaller than any lateral dimensions of said head and greater than any lateral dimensions of said neck section and of said peripheral groove, said transition section reducing the lateral dimensions of said pin between said cylindrical shank section and said neck section, and including a shoulder contiguous to said cylindrical shank section and a non-threaded intersection contiguous to said neck, said pin being made of material which can be work-hardened, and said intersection being work-hardened the better to resist fatigue forces, said inherent strengths of said head section and peripheral groove being substantially equal and only sufficient to resist axial tensile forces exerted by bending in a shear flow joint, and said inherent strength of said cylindrical shank section being sufficient to resist shear forces in said joint.