Anybody know where to find proof strength and yield strength (in psi) for inch size alloy steel button head and flat head socket cap screws? I spent a couple of unsuccessful hours searching on the Internet and in reference books, and talking to manufacturers and suppliers. Found ultimate tensile. Found proof, yield, and ultimate for regular socket caps. But could not find proof and yield for button head and flat head. If consistent with regular socket caps, specs will be higher for 1/2" dia and under than for over 1/2" dia.
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