DLMS™ Summary National Stock Number 1020-00-344-5121 National Stock Number (NSN) 1020-00-344-5121, or NIIN 003445121, (piston) has an unknown assigned date. NIIN 003445121 was cancelled on January 1, 1963, with a cancelled status of "Item is Cancelled as Duplicate." This NSN was replaced by NSN 4320002186289. This NSN does not replace any other NSNs. There are no manufacturer part numbers associated to this NSN. This part number has not been procured by the US Government in over 5 years. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 1020003445121 does not contain precious metals. This information was last updated on May 04, 2012.