| Iv'e been asked this before and sent this_
normal Zinc plated bolts have a tensile strength of 500 Newtons/mm2
stainless steel basically starts at 500 N/mm2 for class 50 up to 800 N/mm2 for class 80.
High tensile bolts are about 800 N/mm2 - usually stamped 8.8 on the head.
So if you want to be really sure about the strength get some stainless steel grade A4 class 80. Alloy fasteners have a huge range due to the various metals available, but are unlikely to be over class 80 on a bike.
also you have to be carefull about putting stainless bolts into alloy as disimilar metals react with each other causing corrosion, this can be prevented using copaslip or similar - there was a post about this very recently - you then have to reduce the tightening torque to copensate for the lubricate tread - to about 60% of the stated torque.
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