A wide range of threaded fasteners for structural applications is available to fulfill the ever-increasing demands of the aerospace industry. Each of the basic designs was developed to fulfill a need and, consequently, possesses certain characteristic features defining that need such as extended fatigue performance, superior notch toughness, exceptional corrosion resistance, and new wrenching configuration. These characteristic features, in combination with the dimensional and mechanical property characteristics, define a product having a potential performance capability. The objective is to define the basic parameters considered mandatory for utilizing this performance capability in a structure.