Re: Fastener materials and grades
Pretty good - the rub on consumer purchased Grade 8 hardware is that it now often is imported and indeed not properly secondarily heat treated and is indeed more brittle than properly treated alloy. To say Grade 8 is too brittle or weaker or something like that is not correct when speaking generally, I agree.
I agree on paper about All-Thread. On the other hand decently procured M8x1.0 (when called for) makes excellent and stronger than necessary head studs for HT engines. They will last the lifetime of the rest of the engine.
Can you explain to the group about metric bolt grading.