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Owns A Torsen
Joined: Mon Sep 18th, 2017
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there is no exact equivalent, the metric hardness in bolts has more "layers" if you will.
8.8
9.8
10.9
12.9
8.8 if I remember from using them is actually harder than a grade 5 not by a lot but it is. Or was when I was curious and had a rockwell tester in front of me.
10.9 is accepted around the shop as a grade 8 equivalent but if you grind a spot and throw them on the rockwell tester they are a small level up.
12.9 has its purposes but too brittle IMO for any application that might move a lot. Might as well just weld it.
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