Needed some bolts for the steering arms on a 48 Plymouth so naturally bought grade 8. Inside of rotor was brushing the head of the bolts so chucked up in lathe and being grade 8 figured I'd have to grind them. Carbide tool was in the holder so decided to give it a try---cut like butter. Traded carbide for HSS tool and still cut off big bites. Chucked one of the nuts up and same thing. Then used hack saw with a HF blade and sawed a groove in one. The nuts/bolts came from Fastenal but I'd be every supplier has the same fake Chinese bolts. For control I dug up some ring gear bolts for a 37 Buick and flywheel bolts for a 46 Ford. Hack saw blade would just leave shiny mark but not cut at all. If someone like ARP actually has real American hardware that's what I'll buy and damn sure not pay big bucks for grade 8 when I'm not even getting grade 5.