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Usually if I see a tolerance on the A datum points, it's a (circled F) free state check prior to clamping. Otherwise, Datum A is Datum A. There is no tolerance, because it's datum A. But, in real life, parts aren't perfect. Depending on how you are measuring the parts, you might see more deviation. If you have a good fixture, you should be hitting +/- 0.05mm easily. On a custom standoffs setup, I'm able to hit +/- 0.10mm mostly (depends on what tools you have at your disposal, .005" is the best I have for fixed height changes).
If it's not specifically called out, your tolerance is technically half of whatever the surface tolerance for that surface is (positive only, since a Datum A should theoretically never be negative, while the surface profile around it can be bilateral).
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