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The stainless-steel fasteners that I’ve in inventory are normally labelled A2-70 or A4-80 on the pinnacle of the fastener.
Once I see 8.8, 10.9 or 12.9 on different bolts, they’re the everyday bolts which might be zinc plated or black. They aren’t stainless-steel.
Now the socket head cap screw within the muffler clamp for my GS reveals a 8.8. I used to be capable of buff it up (no rust on them) after a few years and it seems to be stainless-steel. But when held to a really robust magnet (an Apple laptop computer I scrapped and saved the case magnets) the socket head cap screw is extremely drawn to it. 
and 
I do know some stainless steels are barely drawn to a magnet however not as robust as I witnessed.
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