ASME Y14.24 : Types and Applications of Engineering Drawings
A product definition data depicting an existing standard or vendor-developed item with further required selection or restriction of the item for fit, tolerance, performance, or reliability within the range or limits prescribed for the item. Although the existing item is not physically modified, by virtue of the selection technique employed it is demonstratively different from those identified on the document from which the selection is made and, therefore, the existing item is not interchangeable with the selected item. When so restricted, the existing item is re-identified with a new part number from the authoring design activity replacing the original part number.
See Also:
Product Definition Data, Standard, Vendor-Developed Item, Item, Tolerance, Design Activity