Blind fastener e.g. standard bolt, for assembly of composite parts, has cusps with crescent shaped sections, and identical sections laid out in radial symmetry so as to reconstitute cylindrical barrel with complete circular sections

摘要

The fastener e.g. standard bolt, has a set of angular identical sections (1, 2) that is laid out concentrically in radial symmetry, where the identical sections are provided in a half-cylindrical form. A set of gripping rods is truncated and is provided identical with a cylindrical external surface. A set of protruding cusps is arranged with a set of crescent shaped sections, and is provided in contact with a bore (5). The set of angular identical sections is laid out in a radial symmetry so as to reconstitute a cylindrical barrel (3) with a complete circular section.