Patent ID: 8608417

Claim:
A blind clamp comprising: a core bolt comprising a first threaded portion on a first end and a bolt head on a second end, wherein the first threaded portion extends from the first end substantially to the bolt head; an expanding nut comprising a second threaded portion, an end portion, and a bulbing region between said second threaded portion and said end portion, wherein said bulbing region bulbs to form a flange upon application of a first compressive load between said second threaded portion and said end portion of said expanding nut and wherein said second threaded portion is threadingly engaged with said first threaded portion; a shank positioned between said expanding nut and said bolt head; a blocking member that prevents said shank from advancing along said core bolt until a second compressive load is exerted, wherein said second compressive load is greater than said first compressive load; and a back-out nut comprising a third threaded portion threadingly engaged with said first threaded portion.