[KennyBlanken]

Mechanical counterfeit parts absolutely make sense because the cost isn't in making a bolt a particular shape, it's in making sure all the steps in manufacture are consistent and up to standard.

Maybe most of the bolts are made of the right alloy and heat treated correctly, but you're using a crappy furnace with no temperature logging so you don't see that the furnace's temperature dips too low one morning...and you don't test as much of your runs because you cheap out on your QA staff, so you don't catch it.