Thanks for all the replys, folks.

These are non-graded hex head 8mm bolts. Tiny and wimpy looking. They pass thru the large chainring and thread into the smaller chainring, no nut on the back. I'm new to bikes, but I've spent a lifetime around other stuff that use bolts, and as I'm tightening these, I'm getting that familiar twinge in the gut that tells me there isn't far to go before they strip. Good advice on the locktite, though.