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Made of alloysteel,these low-profile screws are nearly twice as strong as their stainless steelcounterparts.With half the height of a standard sockethead,these low-profile screws fit in tightspaces,but are weaker than standard socketheads.Length is measured from under thehead.
Black-oxide steel screws are mildly corrosion resistant in dryenvironments.Fine threads are closely spaced to prevent loosening fromvibration.They are not compatible with coarsethreads.
Screws that meet ASTM A574 comply with specifications and testing requirements for materialquality.