Spent some time as a Mechanical Inspector for a considerable manufacturing corporation. Grade marks and countries of manufacture for fasteners was a regular assignment too. Rc hardness, plating, size and pitch, headstamps, design related dimensions like you see in the Machinery Handbook, are just a few.
Counterfeiting of hardware is widespread; hence screening EVERY package, regardless of distributor, even those purchased for maintenance department. Now, to some it would seem obvious that substandard hardware is unacceptable in items built for the government. But maintenance? Sure.
You want SAE Grade 5's holding up that overhead conveyor or just some interpretation of same? Crosby or equivalent lifting eyes or something marked 'China'?