National Stock Number
4730-00-278-5551
National Stock Number (NSN) 4730-00-278-5551, or NIIN 002785551, (inverted nut,tube coupling) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN replaces 3 stock numbers: 4730002030543, 4730002891958, 4730002788833.
There are 4 manufacturer part numbers associated with this NSN. 4 of those part number(s) are considered obsolete. The manufacturer part numbers were originally supplied by 4 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.
This part number has not been procured by the US Government in over a year. There has been one contract issued for this part number, with one award given. The US Government has only awarded those contracts to one supplier. The last contract numbers awarded were: SPE7M325PZ046. The total value of the awarded contracts has been US$ 975.00.
This NSN is somewhat common among different platforms, belonging to 5 different weapons systems.
There has been very little demand for this national stock number. The demand for this NSN originated from less than 5 countries. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Feb 15, 2017, this NSN's acquisition method was noted as: Acquire directly from the actual manufacturer, whether or not the prime contractor is the actual manufacturer. The annual buy value of this part falls below the screening threshold of $10,000 but it has been screened for known source(s). (NOTE: This code shall not be used when screening parts entering the inventory. It shall not be assigned in preference to or supersede any other AMSC.) Valid AMCs: 1, 2, 3, 4 and 5.
This NSN is assigned to Item Name Code (INC) 03857. [AN EXTERNALLY THREADED FASTENING DEVICE WHICH HAS AN INTERNAL OR EXTERNAL SEAT, DESIGNED TO MATE WITH THE SEAT OF AN INTERNALLY THREADED TUBE FITTING FOR THE PURPOSE OF SECURING THE TUBE TO THE FITTING TO FORM A LEAKPROOF CONNECTION.]. 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 4730002785551 contains an unknown precious metal.
This NSN is associated to Schedule B 7415338550: other copper screws (not for wood) bolts and nuts. 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.