Part Number changes to a UID-marked item do not affect the Original Part Number or its Unique Item Identifier (UII), even when using Construct 2. Instead, a Current Part Number (CPN) is applied to the item as a supplementary label and submitted to the IUID Registry in accordance with the following excerpts from MIL-STD-130N[1] on the topic.
5.2 MRI Marking
5.2.1.3 Part or identifying number (PIN – see 3.2) or unique lot / batch number.
- When the PIN rolls/changes, the new current PIN should be marked on the item in accordance with the applicable MRI protocol requirements (see 5.2.2) using the applicable MRI protocol data qualifiers in Table VI. The new current PIN may be encoded in a single Data Matrix symbol along with the UII data set elements at the discretion of the MRI protocol used.
For UII Construct #2 applications, the original PIN, original lot number, or original batch number shall continue to be clearly identified and encoded in the MRI. When the PIN is changed, the source enterprise (manufacturer or supplier) EID that assigned the PIN should also be clearly identified on the item if different from the source (manufacturer or supplier) EID in the existing mark.
Current Part-Number(CPN) Label (Mil-Std-130N)
NOTE: Where instances of duplicate PIN assignments arise within the enterprise, enterprises may choose to utilize item identification (see 3.2) by prefixing the PIN with the original design activity identification, such that each part is distinctly identified within the enterprise.
3.2 Term Definitions.
Machine-readable information (MRI) marking. A pattern of bars, squares, dots, or other specific shapes containing information interpretable through the use of equipment specifically designed for that purpose. The patterns may be applied for interpretation by digital imaging, infrared, ultra-violet, or other interpretable reading capabilities.
Part or identifying number (PIN). The identifier assigned by the original design activity, or by the controlling nationally recognized standard, that uniquely identifies (relative to that design activity) a specific item. (IAW ASME Y14.100) For ordnance items, the PIN may be the item’s NSN for some applications. The PIN is not a serial number or UII.
See also: