National Stock Number
5315-01-631-5991
National Stock Number (NSN) 5315-01-631-5991, or NIIN 016315991, (pin,cotter) was assigned September 18, 2014 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. 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.
This NSN is unique to one weapons system.
Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Sep 19, 2014, this NSN's acquisition method was noted as: Acquire only from the prime contractor although the engineering data identifies the Commercial and Government Entity Code (CAGE) and part number of a source other than the prime contractor. The Government physically does not have in its possession sufficient, accurate, or legible data to purchase this part from other than current source(s). (NOTE: This code is applicable only to parts under immediate buy requirements and only as long as the deficiency is under review for resolution and appropriate recoding.) Valid AMCs: 1, 2, 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 02381. [A HALF ROUND, CYLINDRICAL, OR FLAT PIECE OF METAL, BENT TO FORM A STRAIGHT OR CRIMPED TWO-PRONGED DEVICE WITH AN EYE AT ONE END, FOR INSERTING IN A HOLE DRILLED AT RIGHT ANGLE TO THE AXIS OF THE STUD, SHAFT, OR LIKE ITEM. ITS ENDS ARE SEPARABLE OR ONE END IS BENT TO HOLD IT IN PLACE.]. 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 5315016315991 does not contain precious metals.
This NSN is associated to Schedule B 7318240000: cotters and cotter pins, of iron or steel. The Schedule B End Use is listed as finished metal shapes. NAICS classification category 332722: bolt, nut, screw, rivet, and washer manufacturing.
This information was last updated on Aug 01, 2025.