I'm guessing our drug-addled workforce is at fault.
Yet another previous employer used to buy stainless exhaust flanges from a US foundry and have them machined by a US machining house. We had continuous problems with cast features not being where they were supposed to be, and features machined where the cast material wasn't. We changed foundries and machining houses several times, always with the same results, _plus_ unforecasted delays in shipment because our small quantities didn't always fit nicely in their production schedules.
So we started buying complete machined flanges from China, one source. All were perfect, and on time, and cheaper,
and better looking.
Mike Halloran
Pembroke Pines, FL, USA