MOST stainless bolts are very weak. About the equivalent to Grade 2 hardware-store junk.
SOME stainless bolts are almost as strong as Grade 5. Not impossible to find, tend to be somewhat expensive.
DAMNED FEW stainless bolts are anywhere close to Grade 8, and they're wildly expensive.
Pretty-much any stainless bolt/nut will need anti-seize to prevent galling. Without it, stainless bolts tend to be "one-use" and have to be broken or cut to get them apart.
Stainless is not my first choice for that application. Regular Grade 5 is entirely suitable; although I like the crimped, all-steel lock nuts rather than Nyloc nuts.
"316" stainless bolts can range anywhere from about Grade 2 equivalent to slightly better than Grade 5 for tensile strength. It's difficult to know what you're buying, especially with Communist Crap infesting the bolt bins.
Yield strength sucks, though. At best, about the equivalent to Grade 2, but potentially much worse.