The present invention provides a blind bolt fastener having a core bolt. The core bolt has a threaded portion and a non-threaded portion engaging a deformable sleeve and a body. A protrusion extends from the sleeve or the body to engage a groove in the core bolt to prevent axial movement of the core...http://www.google.es/patents/US7857563?utm_source=gb-gplus-sharePatente US7857563 - Mechanically locked blind bolt fastener
