I have been involved with the Pre-Installation verification of hundreds, if not thousands of kegs of bolts with various mfg's and lot numbers over the years, and have yet to have a single TC bolt fail pre-installation verification. <crosses fingers hoping that I didn't just jinx myself with that statement>...LOL
I guess that you were glad that you performed the pre-installation verification on that lot of bolts.....shudder to think what could have happened as a result of high strength bolts failing in service.
Please post up the results from the bolt mfg once that information is available. I'm curious what went wrong with those bolts....
BTW, were these galvanized fasteners by chance?