But there are many different steels that bolts are constructed from. Your average joe blow Home Depot fasteners are rather unknowable, tensile strength wise. In aerospace applications, we routinely use fasteners that have an Ftu (ultimate tensile strength) of 180 ksi. Those are the usual ones. There are 260 ksi fasteners available, but they are pricey!!!! Those are an alloy MP-35 or 65 or something like that. Does not come to mind right now. Could be the rum.....