New
Marking Standards for Military (MS) Parts
 Due to abuses by offshore and U.S. based gray market counterfeiters,
the U.S. government has imposed a new marking standard for MS part
numbers. Legitimate franchised and approved sources are now marking
MIL-STD-5015 connectors with a J prefix. The MS prefix was not
copyrighted and could be copied without any recourse by unscrupulous
counterfeiters, but the U.S. government has protected the JMS call
out – as they did previously for older JAN call out. So if you order,
say an MS3106F connector, it will come marked JMS3106F – as it should.
If your supplier is shipping you old MS nomenclature parts, beware
of your source of supply. Approved military marking should include
the J or JAN prefix.
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