Caliper mounting bolts - safety question

I have an LS1 brake upgrade waiting to go on my 94, but I had to track down the caliper mounting bolts separately. The dealer that I found only had three of the actual GM part numbered bolts that I needed. So, I went to Lowe's and found a bolt with the same length, threads, etc, and bought one of those to finish out the set.

My question is, are the GM bolts of a higher strength than the off the shelf one I picked up from Lowe's, and if so, would there be any risk of the Lowe's bolt breaking. These bolts are fairly substantial, and it would take a heck of a force to snap one, but I wanted to consult the board and see if anyone had any insight.

I know the caliper mounting bolts on the rear are really weak (I snapped one off with little effort) from the factory. Any thoughts? thanks.

You would have to check the "tic" marks on the bolt head to determine the grade strength. Typically GM uses Grade 8 hardened for brake hardware. I doubt that the bolt from Lowes is that high.

Personally, I wouldn't use it. If you DO use it, only use it till the dealership can order another correct bolt.

Link to bolt cap markings chart.

http://www.boltdepot.com/fastener-information/Bolt-Grade-Chart.aspx

Thanks, I'll double check it when I get home