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If the friction on the head were immaterial then a lock washer wouldn't work.
I believe that technically the threads under tension alone should keep a bolt tight. Obviously both are factors, loctite locks a thread in place while lock washers create friction on the mating surface.
Personally I would be more concerned about anti-seize on a stud than powder-coat, yet anti-seize does not appear to make studs come loose. The one caveat might be thickness, an uneven mating face would not be good.
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