Button Head Cap Screw Fine & Full Thread Black-Oxide Alloy Steel 1/2-20 * 1-1/2" Grade 8 [Cup Point] [Allen Drive]

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With a tensile strength of 170,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head. alloy steel screws are mildly corro sion resistant in dry environments. Fine and extra-fine threads are closely spaced to prevent loosening from vibration: the finer the thread, the better the resistance. They are not compatible with coarse threads. Show more