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Placement of the datum feature symbol (triangle) can be critical. In the first three views below the datum feature symbol is associated with the size dimension of a feature of size. They indicate that a datum axis should be established using the feature indicated.
In the view below, because the datum target feature is offset from the size dimension line, the datum may be interpreted as a line lying in a plane tangent to the feature indicated. If line contact is desired, a datum target plane should be indicated.
This tip is in accordance with ASME Y14.5M-1994, Y14.5-2009 and Y14.5-2018. This tip was originally released in September 1999.