Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym NPSM is...

NPSM is

  • National Pipe Straight Mechanical thread

NPSM is also in:

Acronym Definition Searched: PSK SSR HOOD CTF DARO SS 04042 SSMP WZA CSAB WXLJ BC OAV 949 DOC