Hi,
in the standard ISO, for Metric Coarse, the pitch must be removed in the dimension. For example, in the image attached, M12 is the correct representation and the M8 incorrect. I've edited nx502_Threaded_Hole_Standard.xml that is shared via UGII_THREADED_HOLE_STANDARD_DIR. I've edited the Callout tag in the xml file, for example Callout="M8 x 1.25" is become Callout="M8". Close and reopen NX, but the new callout dimension are M8 x 1.25. Where I wrong ?