Here is a video on the bolt manufacturing process. I suspect that the rod used to make the bolt had a weld at the point of separation. There would be nothing the manufacturing process that would have caught the defect. Your app;ication of torque was the first real stress that it saw. https://www.google.com/search?q=making+bolts&ie=utf-8&oe=utf-8&client=firefox-b-1#kpvalbx=1
I have seen this before. One time only. Failure was explained as differential cooling during heat treat. Whether true or not, it does not give one confidence in the remain bolts!
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