1/4-20 x 3-3/8 Elco Dril-Flex / Hex Washer Head / Steel / Stalgard / QTY 500 it's that simple

it's that simple

Lower-hardness load bearing area provides increased resistance to Hydrogen-Assisted Stress Corrosion Cracking when compared to case hardened fasteners

Better yet

compared with fasteners with standard zinc plating

High strength

1/4-20 x 3-3/8 Elco Dril-Flex / Hex Washer Head / Steel / Stalgard / QTY 500 it's that simpleDril Flex Structural Screws are dual heat treated self drilling tapping screws that provide the strength, ductility and resistance to embrittlement required for critical applications. Features & Specs High hardness point and lead threads for drilling and tapping Stalgard and Stalgard SUB Coatings provide improved corrosion resistance as well as enhanced galvanic compatibility in dissimilar metal applications, including those involving aluminum,