5/8-11 x 1-1/2 Tap-Flex Thread-Forming Structural Screws, Hex Washer Head, Alloy Steel with Silver Stalgard SUB Coating

5/8-11 x 1-1/2 Tap-Flex Thread-Forming Structural Screws are dual heat treated, self-tapping fasteners that provide the strength, ductility, and resistance to embrittlement failures required in critical curtain wall and dissimilar metal applications. Tap-Flex fasteners are engineered to replace nut and bolt assemblies and Taptite® fasteners commonly used in building construction.