well i know they arent grade 8 at least, grade 8 was pretty much reserved for use for things like shackle and leaf spring eye bolts and such
are you loooking for new oens ? i have some and the nuts too, i dont need them, they are not chrome they are light metal color like new hardware from hardware are, but are from GMC Paul's not a hardware store, if you want them, trade me something or just a few bucks ands mail ?