Screw Strength

Hi All,
Anyone know what is the tensile or pullout strength of a #8-32 screw used to
secure fixtures to overhead outlet boxes? There are two screws holding the
bracket to the outlet box. Is this size safe, or do I need #10-32? Is
there a table of tensile strengths of screws available on the web?
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The NEC says less than 50 lbs if it is a luminaire (light fixture). Fans need the stronger (10-32) box listed for the purpose.
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