Patent ID: 7384226

Claim:
A blind fastener comprising: a mandrel and a monolithic cylindrical body mounted on an elongate stem of said mandrel so as to extend co-axially about a central axis of said blind fastener; said body having a pre-formed radially enlarged flange at one end thereof and a tail end at the opposite end for insertion through a hole in a work piece having an outer surface; said mandrel having a mandrel head in operative engagement with said tail end of said fastener for transmitting force thereto during setting of said fastener, said body, annularly disposed about the mandrel, having first and second generally cylindrical portions, each having differing uniform external diameters and a radially extending shoulder therebetween, such that the external diameter of the second portion adjacent the flange is greater than the external diameter of the first portion adjacent the tail end and said body between said shoulder; and a sleeve of resilient material disposed about the second portion, wherein said radially extending shoulder contacts said outer surface of said work piece and said shoulder is configured to bear against a portion of the outer surface, and whereby after said setting of said fastener said first portion is deformed and said sleeve of resilient material remains exposed beyond said outer surface for providing a stop surface, and said sleeve of resilient material defines an inner surface which is in uninterrupted contact with and covers only the entire second portion between an exterior surface of the work piece and the flange.