There exists Bore A; a cylinder bored thru a 3" cube. Bore A is used as the Primary Datum. There also exists Bore B. Bore B is also bored thru the 3" cube at a 90° angle to Bore A. The intent is to have the axis of Bore B intersect with the axis of Bore A. Not being a perfect world, however, the axis of Bore B will sometimes fall above or below the axis of Bore A. What GD&T callout would best accomplish the intent? Concentricity? Position? Position with something else, perhaps perpendicularity? Is concentricity a legal callout for an intersection of two cylinders? My thought is that it is not, as the definition of concen. requires all mid-points to be congruent with the axis of the datum feature. With the two bores at right angles to each other, that would be impossible as most of the second bore axis would lie outside of the cylindrical tolerance zone of the datum feature. (except where the axis of the second cylinder passes through the diameter of the tolerance zone surrounding the datum axis. Right?)