5/8"-11 x 3" Tap-Flex® Thread-Forming Structural Screws, Hex Washer Head, Alloy Steel with Silver Stalgard SUB Coating

These thread-forming 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® screws are threadformers with the patent-pending E-form® segmented thread profile. This design improves both installation and in-place performance.