Adding to BTB's comments... alternate perspective...
I work with fairly old drawing [1950s]... the corporate standard... which helped evolve MIL-STD-100... has always been...
Dimensions 'before plating' and dimensions 'after plating/grinding' are mandatory for critical fits [must be on drawings]. Otherwise the machined dimension is as shown... and plating/coating finish thickness is additive [but controlled by finish specification].
Another perspective...
Generally speaking dimensions controlled to [4] decimal points mandate plating/coating thickness control. This is especially true for mechanical 'hole-to-shaft' fits, cam-surfaces, precision mechanical parts [close-tolerance fasteners], etc.
Generally, for [3] and fewer decimal places, plating/coating thickness control is pretty-much irrelevant.
NOTE. IF dimensions between a bolt and a '3-decimal point hole are somewhat critical', then generally the hole would have a special Flag Note regarding 'what to do', IE: 'no finish' [= mask-off]; or 'plating ONLY, omit primer], etc...
Regards, Wil Taylor
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