The Marking

According to MIL-STD-130N:

Machine-Readable Information Marking:

Machine readable markings should be applied to all items subject to DFARS mandated IUID criteria.

UII Limitation: 

Limited to 50 characters, in compliance with ISO/IEC 15459-4.

Lettering:

All letters must be capitals without serifs (sans-serifs). Fonts that may be used include Arial, Futura, Gothic, Trebuchet MS, or any other sans-serif fonts.

Numerals:

All numerals should be Arabic. Roman numerals may also be used if designated by an applicable industry or Government standards.

Data Matrix:

The minimum marking is a Data Matrix ECC200 symbol, in accordance with ISO/IEC 16022. Items need to be marked according to ANSI MH10.8.7. The data elements need to be encoded into the Data Matrix Symbol using the syntax of ISO/IEC 15434 with:

• Format 05 for Application Identifiers (AI)
• Format 06 for Data Identifiers (DI)
• Format 12 for Text Element Identifiers (TEI)

The module size should be no smaller than 0.0075 inch (0.19 mm) and no larger than 0.025 inch (0.64 mm).

Square symbol sizes may not exceed one inch (25.4mm).

Linear Bar Code:

Linear Bar Codes may be:

• Code 39 Symbols
• Code 128 Symbols
• GS1-128

Ratio of wide element to narrow element: within range of 2.1:1 to 3.1:1.

The narrow element dimension (X dimension) range should be: 0.0075 inch (0.19 mm) to 0.015 inch (0.38 mm).