Price may change with quantity see chart under PROMOTIONS
With a tensile strength of170,000psi,these alloy steel screws are stronger than Grade 8 steelscrews.Length is measured from under thehead.
Black-oxide steel screws are mildly corrosion resistant in dryenvironments.Fine and extra-fine threads are closely spaced to prevent loosening fromvibration:the finer thethread,the better theresistance.They are not compatible with coarsethreads.
Screws that meet ASTMA574,ASTMA574M,and ISO898-1comply with specifications and testing requirements for materialquality.