military specification # blah-blah blah- blah
It is a specific process that must be used during manufacturing. It could cover coatings, the coating applications, machinig methods or or just plain ol' anything. The SR 71 Blackbird had a problem with titanium bolt heads on the wings melting at operating temperatures... The culprit: minute traces of cadmium from the mechanics wrenches..... Mil-spec# (whatever) is born: wrenches used in assembly must be
made of 4140 stainless with no coatings and blah blah and so on.
Now you have the mil-spec 500$ government wrench.
I was on a Boeing project that called for a mil-spec coating that someone overlooked when bidding the job.
Called the Boeing engineer and explained that the coating costs 600$ a gallon. He cussed and said in colorful language " just paint them safety orange, its a fixture, we need to have our butt covered when some idiot trips over one.
Mil-spec is and could literally cover anything.
Anyone can assign any mil-spec to any blueprint... It gonna cost you big time tho