MIL-DTL-13931J
3.4.7.5 Time of marking. Marking involving alteration of the item surface (stamping, engraving,
embossing and the like) shall be done before application of any specified protective coating (anodize,
phosphate, oxide, paint, etc.) and shall be legible after application of the coating. Items showing marking
requirements at assembly (weldments, sheet metal fabrications, and like assemblies) may have the
marking applied to the detail part before assembly to facilitate manufacture.
3.4.7.6
Detailed identification.
3.4.7.6.1 Specification control drawings. The identification marking for items depicted on specification
control drawings shall consist of the manufacturer's identification and the manufacturer's part number.
3.4.7.6.2 Source control drawing. The identification marking for items depicted on source control
drawings shall include letters "SOCN" (SOURCE CONTROL NUMBER) between the design activity
code and part (drawing) number. In addition, the manufacturer's identification and manufacturer's part
number shall be marked below the source control number.
Example:
"19206 SOCN 1234567
MFR 54321-9876543"
3.4.7.6.3 Altered items. When an item is altered, the identification number assigned by the activity
specifying the alteration shall be marked on the item, and the original identification shall be obliterated
without damaging the item.
3.4.7.6.4 Manufacturer's identification. All parts and assemblies requiring marking shall be identified
with the manufacturer's code identification (CAGE) number, name or registered trademark prefixed by
"MFR" and located below the design activity code identification and part numbers. Manufacturer's code
numbers are listed in Cataloging Handbook H4/H8. Directions for obtaining numbers are as specified
therein.
Part
Assembly
Example: 19206-1234567
Example: 19206 ASSY 1234567
MFR 54321
MFR 54321
3.4.7.6.5 Serial numbers. Serial numbers, when assigned by the Procuring Contracting Officer, shall be
applied as specified on the applicable drawings or in the contract.
3.4.7.7 Functional markings. Markings specified for operation, handling, adjustment or assembly shall
be in accordance with the applicable drawing.
3.4.7.8 Inspection approval stamp. When the marking requirements on a drawing include the term
"INSP", the Department of Defense complete inspection approval stamp shall be applied in the space
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