MIL-STD-2414A
3.10 National Stock Number (NSN). A thirteen-position number used to identify items of supply. It consists of a four-position Federal Supply Classification (FSC) and a nine- position National Item Identification Number (NIIN).
3.11 Quiet Zone. The area immediately preceding the start character and following the stop character. This area contains no markings and provides the same reflectance as the spaces.
4. GENERAL REQUIREMENTS
4.1 3 of 9 bar code description. The 3 of 9 bar code description is explained in ANSI/IAM-BC1-1995.
4.2 HRI. The NSN number and edition number shall be encoded and printed. The start and stop asterisks shall not be printed. The HRI is intended to be used only for human recognition and is not intended to be machine readable.
4.3 Security. Bar codes generated by the use of these standards shall be unclassified. The NIMA inventory system is operated at the unclassified level.
5. DETAILED REQUIREMENTS
5.1 Minimum dimensions.
Bar Code Height. 6.35mm (.25")
Space between code and Human Readable Interpretation
(HRI) .25mm (.01")
Text "NSN" 3.175mm (.125")
NSN number height. 3.175mm (.125")
NRN height. 3.175mm (.125")
Text "NIMA REFERENCE NO.", and "ED. NO." or "EFF.
DATE" 1.Bmm (0.7")
Edition number height. 3.175mm (.125")
Minimum margin below HRI. 1.524mm (.06")
Quiet zone before and after code. 6.35mm (.25")
Space between bar codes 12.7mm (.5")
5.2 Dimensions not listed. All dimensions not listed shall adhere to ANSI/AIM-BC1-1995.
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