Regular stainless steel bolts are just a little stronger than grade 2 bolts. ARP makes grade 8 stainless but as has been mentioned, they are pricey. I would not use regular stainless as Neonlarry pointed out because of the lower strength.
I would make sure of the stainless grade and tensile strength if it is used in a structural application such as the frame. (Gauling can be a problem with stainless, also). A lot of fasteners are being made off shore so this is another reason to be cautious and verify what you are getting.
Jim
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