Improved blind fastener

Claim 1

A fastener comprising a bolt having an externally threaded shank, a bolt head at one end of the shank and diametrically opposed flats at the other end of the shank, a tubular body having a shank, an enlarged preformed head at one end of the shank and a threaded bore extending through the hEad and shank of the body, the head of the body having flat wrenching surfaces around its outer periphery and having a flat upper surface remote from the shank of the body, said upper surface having a plurality of circumferentially spaced recesses, each recess presenting two opposed abutment surfaces, each abutment surface intersecting and being contiguous with the bore and extending generally transversely of the head and longitudinally of the body, said bolt being threadedly engaged in the bore of the body and projecting from the ends of the body, the head of the bolt being disposed adjacent the shank, an expandable tubular sleeve disposed on the shank of the bolt between the head of the bolt and the shank of the body, the arrangement being such that by rotation of the bolt relative to the body, the tubular sleeve may be expanded to form a blind head and that after formation of the blind head the shank of the bolt is adapted to be deformed into one or more of said recesses whereby further rotation of the bolt relative to the body may be prevented.