Improved composite blind fastener.

摘要

A blind fastener (20) having a nut (21) having an axial bore (23) therethrough and with a nose at one end (24) and an enlarged head (26) at the other end, a bolt (30) having a stem (31) extending through said nut (21) and having an enlarged head (32) opposite to said nut (21) nose, and a first sleeve (40) on said bolt (30) stem (31) between said nut (21) nose and said bolt (30) head (32), said first sleeve (40) having a thick wall section (41) adjacent to said bolt (30) head (32) and a thin wall section (42) extending toward said nut (21) nose formed by a recess (43) in said section. A second sleeve (100) is mounted on the stem (31) between the first sleeve (40) and the bolt (30) head (32) which forces the thin wall section (42) to deform first outwardly then inwardly to form a bulge (105) before the thin wall section (42) engages the surface of the parts (27, 28) being fastened.