Shigley's text book states that the proof load of a bolt is roughly the same as the yield strength. Does anyone know what the proof load or yield strength would be for a typical 3/8" diameter, 300 series stainless steel hex head bolt, the kind you would buy at a hardware store. McMaster-Carr shows 316 stainless bolts as having a minimum tensile strength of around 70ksi, but that I assume is the ultimate tensile strength. I am looking for the yield or proof strength. Shigley also says to tighten a grade 8 steel bolt to 90% of its allowable proof load. Would you also tighten a stainless steel bolt to 90% of its proof load?
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