Two standards govern this. EN ISO 8062-3 sets tolerance grades for cast dimensions (DCTG), and ISO 2768 sets general tolerances for machined dimensions. A buyer qualifying a supplier asks for both.
We have not published our grades yet. What we can say concretely is that one of our brackets is cast to critical tolerances for a bearing fit and for pressure tightness, with no machining afterwards. That shows more can be held as cast than many expect, but it is an example, not a blanket guarantee.
The practical rule: put tight tolerances only where the function actually needs them. A handful of critical dimensions on a bracket is common. Many more than that are usually inherited from a drawing originally made for machining from solid.
How to state the requirement in an enquiry: give a grade and a standard, not an adjective. “CT 8 to EN ISO 8062-3 on cast dimensions, ISO 2768-m on machined” is a requirement that can be assessed and priced. “Good tolerances” is not. At the same time, mark which dimensions are functional — bearing fits, hole spacing, seating faces — and which are merely nominal. That marking decides how many operations the part ends up with, and therefore the price per part.
Remember too that the tolerance on a cast dimension grows with the dimension. A tolerance grade is not one number but a table where the band widens with the nominal size — which is why a requirement that is comfortable over 20 mm can be unrealistic over 200 mm on the same part. And where a dimension crosses the parting plane, the die closing tolerance is added on top; such dimensions should either be placed in one die half or machined.
The verification side, meaning measuring equipment, measurement reports and first article inspection, is where we have the least documented in public. If you have requirements for inspection and documentation, say so in your enquiry and we will answer specifically.