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I used this: http://www.unified-eng.com/scitech/hardness/hardness.html to approximate tensile strength, which assumes carbon and alloy steels in the annealed, normalized, and quenched-and-tempered conditions.

Since it has a hardness of 45Rc this equates to a tensile strength of roughly 214,000 PSI, which is higher than a grade 8 bolt to my knowledge. I have no idea what this is

The only other information I can add is I just tested the hardness, and the bolts are coming out ~45Rc. Can anyone help suggest what grade this might be?

Yes, I cannot find a clue anywhere as to who made this or what it's properties may be.

I have 8 hex head bolts I pulled from a load cell and cannot identify the manufacturer or properties of these bolts. The only information I have is engraved on the head of the bolt is the symbol "I^2" (without the ^ symbol). Can anyone help point me in the right direction here?