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Chez311 Thank you so much for your response.my confusion is about what is the difference in the effect of using datum refernce at MMB and datum reference at RFS for a profile callout. Why we go for profile datum reference at MMB.

Chez311 I'm using Y14.5 2009 standard and sometimes i am getting confused with those explanation in the standards.It doesn't covers any explanation for profile callout with datum references at MMC.

Little bit confused with calculating the virtual boundary when the feature having datum reference at MMC. I know datums at MMC will result in datum shift but it really changes the boundary of the features or not??? I saw some calculation in some pages where they haven't considered the datum...

Mkcski Can you explain with some examples for related and unrelated actual mating envelope?

Why we use gages at virtual size when datum is called out at MMC??

dgallup Thanka for your response.It would be helpful if I have chart with max/min minor and major dia values for each thread specification like we have it for the metric threads

UNC chart

Shall we consider a profile tolerance with datum referenced at mmc as additional tol in stackup analysis