Zero Position - No Material Modifier - Sortof

Is this a 'legal' callout? We have 4 holes thru the face of a cylindrical part. You know the drill - I can't include the actual print. If need be, I can mock something up.
Datum A = OD, Datum B = Top plane of cylinder, Datum C = 1 of the 4 holes. Should there not be a material modifier here on the position tolerance itself?? Or is the effect the same b/c Datum C is one of the 4 holes?

I'll contact our customer...but they won't likely respond for a month or two...

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Neil Challinor over 1 year ago

I'm leaning towards it being an invalid callout. ASME Y14.5 talks about the principle of applying zero tolerance at MMC but I've never seen any examples like your screenshot. Contacting the customer is the best approach here rather than second guessing. I would also ask them to confirm the interpretation of datum C - is it a single hole or is it all four holes as a pattern?
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Neil Challinor over 1 year ago

I'm leaning towards it being an invalid callout. ASME Y14.5 talks about the principle of applying zero tolerance at MMC but I've never seen any examples like your screenshot. Contacting the customer is the best approach here rather than second guessing. I would also ask them to confirm the interpretation of datum C - is it a single hole or is it all four holes as a pattern?
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