blind fasteners are used to connect two or more workpieces together , and are particularly useful in aerodynamic designs . in such uses , it is very desirable to have a substantially flush surface . the present fastener comprises a fastener body having an axial bore therethrough and an enlarged head , a corebolt passing through the axial bore , the corebolt having a first portion , a threaded second portion , and a localized weakened region therebetween , a drive nut configured to fit around and threadingly engage the first portion of the corebolt , and a stop member that substantially prevents further withdrawal of the corebolt relative to the drive nut after the corebolt has been driven a predetermined distance during installation to shear the corebolt at the weakened region .