Abstract: A structural splitting self plugging pull mandrel blind rivet includes a tubular rivet body and a T-mandrel disposed therein. A locking plug is provided on the T-mandrel and includes a locking section having a plurality of locking rings and a shoulder including a secondary locking mechanism. The secondary locking mechanism preferably includes a peripheral groove in the shoulder with a peripheral lip protruding above the shoulder at each longitudinal side of the groove. The peripheral lip adjacent the mandrel head protrudes further than the peripheral lip adjacent the locking section, with the secondary locking mechanism forming a fishhook profile. The peripheral lips are also bevelled toward the mandrel head and the locking rings in the locking section are circular and spaced from one another.

Abstract: Apparatus for setting blind fasteners, which comprises means for engaging and setting one side of a fastener and driving it in a rectilinear path, means mounted in said rectilinear path for engaging and setting the other side of the fastener and means mounted adjacent the last named means for biasing material on the fastener together prior to the setting of the other side of the fastener.