Abstract: A blind rivet has a first part comprised of a central core having depending circumferentially spaced legs spaced radially from the axis of the first part and radially projecting, circumferentially spaced flanges at an upper end forming a head for the first part. The second rivet part includes a bulbous lower end having an upstanding central core with radially outwardly projecting legs. The legs of the second part are spaced circumferentially from one another and, above the core, are spaced radially from the axis. Upon inserting the first part into the second part, cam follower surfaces on the distal ends of the legs of the first part engage and are cammed outwardly by cam surfaces in curved chaseways between the legs of the second part to set the rivet and grip the undersurface of the elements being connected. The flanges of the first part are received in the spaces between the flanges of the second part and engage the outer surface of the outer element to be connected.