# NSN 4730-00-288-9391: Inverted Nut, Tube Coupling

NSN 4730-00-288-9391 (also written 4730002889391; NIIN 00-288-9391) is an inverted nut, tube coupling in Federal Supply Class 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. 17 manufacturer part numbers from 6 suppliers are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 4730-00-288-9391 (4730002889391)
- NIIN: 00-288-9391 (002889391)
- Item name: INVERTED NUT,TUBE COUPLING
- Federal Supply Class: [FSC 4730 Hose, Pipe, Tube, Lubrication, and Railing Fittings](https://nsnexplorer.com/fsc/4730/)
- Federal Supply Group: [FSG 47](https://nsnexplorer.com/group/47/)
- Acquisition method suffix code: AMSC L: annual buy value is below the screening threshold. (observed 2026-10-10)
- Acquisition method code: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| BSPX | SMALLEST INSIDE DIAMETER | INCHES MINIMUM 0.380 AND INCHES MAXIMUM 0.382 |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| ACSV | TUBE OUTSIDE DIAMETER FOR WHICH DESIGNED | INCHES NOMINAL 0.375 |
| AAJD | THREAD CLASS | 2A |
| FEAT | SPECIAL FEATURES | WEAPON SYSTEM ESSENTIAL |
| MATT | MATERIAL | COPPER ALLOY |
| ABHP | OVERALL LENGTH | INCHES NOMINAL 0.844 |
| ASDB | WIDTH ACROSS FLATS | INCHES NOMINAL 0.625 |
| STYL | STYLE DESIGNATOR | — |
| AJYP | SCREW THREAD SERIES DESIGNATOR | UNS |
| ABUJ | THREAD SIZE | 9/16-20 |
| CRTL | CRITICALITY CODE JUSTIFICATION | FEAT |
| AARN | FABRICATION METHOD | BAR STOCK, MACHINED |
| AASG | CASEHARDENING INDICATOR | NOT CASE-HARDENED |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 19986R1 | 29510 | KOMATSU AMERICAN INTL CO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 19986R1 | 31007 | NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 19986R1 | 92679 | NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 278953R91 | 29510 | KOMATSU AMERICAN INTL CO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 278953R91 | 31007 | NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 28737 | 30327 | IMPERIAL | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 28737R | 30327 | IMPERIAL | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 441392 | 30327 | IMPERIAL | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 45906 | 30327 | IMPERIAL | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 67652D | 29510 | KOMATSU AMERICAN INTL CO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 67652D | 92679 | NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 67652DX | 29510 | KOMATSU AMERICAN INTL CO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 67652DX | 31007 | NAVISTAR INTERNATIONAL CORPORATION DBA NAVISTAR | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 67652DX | 92679 | NAVISTAR INTL CORP MELROSE PARK ENGINE PLANT LOCATION /MELROSE PARK/ | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 81LB3-8 | 30327 | IMPERIAL | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 8F8997 | 11083 | CATERPILLAR INC DIV CATERPILLAR DEFENSE | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 8F8997 | U3363 | CATERPILLAR TRACTOR CO LTD | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-29 | [SPE7LX21D0087/SPE7LX26FBH2Y](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4730002889391) | INVERTED NUT, TUBE COUPLING | ATLANTIC DIVING SUPPLY, INC. DBA ADS | $2.55 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4730002889391&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4730002889391
- AMSC record: https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/
- USAspending contract actions (each award above links to its record)
- All data is public U.S. government data; every row above links to its source record where one exists.

Canonical page: https://nsnexplorer.com/nsn/4730-00-288-9391/
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