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I agree that bolt failure like that is pretty rare, especially for a good quality one. I almost always have to consider the assembly/assembler of the engine. The only time I've seen a bolt fail under those conditions was that it never was torqued properly, just from examining other engines. Many times people like to snug down the nuts prior to torqueing and under some conditions, long hours/frenzied pace, it is not uncommon to miss a nut when dooing final torqueing. I have seen it enough that I always double check if I don't recall doing a specific step. Late nights can cause many things that are operator error and not material, although it is usually the material that gets the blame....it can't argue.
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