Slitting saw arbor types

[Randall Marx]

For an application like that, I would lean toward using a grade-8 bolt. They cut pretty well without needing to be annealed.

 

[Bob Korves]

Dan_S, (and anyone else who might know)
In the Stefan Gotteswinter's videos, he mentions using a graded bolt as the arbor's raw material. I didn't catch specifically which grade he was using.
My question: assume I 'm using a SAE Grade 8 bolt. This would have to be annealed before machining, then re-hardened and tempered, right?
Thanks,
Greg

Stefan would likely be using a grade 10.9 metric bolt for his. They are commonly available here as well. They are about the same strength as SAE grade 8.