yes indeed Bill, I actually googled cast iron tear out with grade 8 bolt earlier today and your right at what I found- 5/8. just for the sake of discussion my 'lazy route' shortening a new stud would give me about 1/2" engagement which for a table saw I suspect would be plenty close enough. This Rockwell contractor saw is not very heavy but 2x4's are a good idea. Did I mention the bolt that sheered off was a grade 5. I'm impressed Rockwell used good fasteners - but not good enough!