Abstract: A flush rivet is configured for joining first and second overlapping structural members together, wherein the structural members define a bore comprising a cylindrical main bore, a cylindrical counterbore and a frustoconical intermediate bore between the counterbore and the main bore. The rivet includes a cylindrical shank dimensioned to be received the main bore, and having a distal end formed as a tail portion that projects distally from the main bore. The proximal end of the shank terminates in a head that includes a cylindrical section having a diameter that is slightly less than the diameter of the cylindrical counterbore, and a frustoconical section, between the shank and the cylindrical section, configured to seat in the intermediate bore. An end face on the proximal end of the head includes a central region having a first radius of curvature that is between 9 and 25 times the shank diameter, and a peripheral region having a second radius of curvature that is less than the first radius of curvature.