Surface roughness standards generally say that the thing you specify is the maximum your willing to accept. But manufacturer could make a finer job if they wished.
I however have a situation where the surface has to be quite rough and im having problems with my supplier naturally making better surface quality than I want.
So for now ive clarified this in text and that works fine for now. But just for clarity, how would i have actually supposed to document this in a standards compilant way in the drawing?*
* Not that i think it would have helped as im pretty sure the machine shop would not have understood it without clarification but just out of curiosity.