DLMS™ Summary National Stock Number 1025-00-131-2506 National Stock Number (NSN) 1025-00-131-2506, or NIIN 001312506, (ring,piston) has an unknown assigned date. NIIN 001312506 was cancelled on January 1, 1963, with a cancelled status of "Item is Cancelled as Duplicate." This NSN was replaced by NSN 4310001735263. 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 1025001312506 does not contain precious metals. This information was last updated on May 04, 2012.