These alloy steel screws are more robust than Grade 8 steel screws, with a tensile strength of 170,000 psi. Under the Head, length is measured.

In dry environments black-oxide steel screws exhibit a moderate level of resistance to corrosion. In damp conditions, zinc-plated steel screws do not corrode. It is simple to identify the screws that have a blue dye finish. Zinc-flake-coated steel screws are on par with Dacromet-coated screws and 20 times more corrosion-resistant than zinc-plated screws.

If you are unsure of the pitch or threads per inch, go with screws with coarse threads, which are the industry norm. Close spacing between fine and extra-fine threads keeps them from loosening due to vibration; the finer the thread, the better the resistance.

ASTM A574, ASTM A574M, and ISO 898-1-compliant screws adhere to material quality standards and testing requirements. Dimensional standards are met by screws that adhere to ASME B18.3, ASME B18.3.1M, ISO 21269, and ISO 4762 (previously DIN 912).