National Stock Number
6540-00-660-0143
National Stock Number (NSN) 6540-00-660-0143, or NIIN 006600143, (prism set,ophthalmic) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.
There are 4 manufacturer part numbers associated with this NSN. 3 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 2 suppliers. Today, 2 suppliers are listed as Active suppliers for this NSN. Of the active suppliers, only one supplier is deemed design controlled or valid supply parts. ISO Group has several sources of supply for this NSN.
This part number has not been procured by the US Government in over 5 years.
This NSN is unique to one weapons system.
Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Dec 01, 2020, this NSN's acquisition method was noted as: Acquire directly from the actual manufacturer, whether or not the prime contractor is the actual manufacturer. This part is a commercial/non-developmental/off-the-shelf-item. Valid AMCs: 1, 2, 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 34744. [AN ITEM USED TO MEASURE MUSCULAR IMBALANCE OF THE EYE OR CROSS EYE AND GENERALLY USED AT READING DISTANCES. A ROD HANDLE MAYBE INCLUDED.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 6540006600143 does not contain precious metals.
This NSN is associated to Schedule B 9002900000: prisms, mirrors and other optical element, mounted and parts and accessories, nesoi. The Schedule B End Use is listed as medicinal equipment. NAICS classification category 333314: optical instrument and lens manufacturing.
This information was last updated on Aug 01, 2025.