# NSN 5310-01-578-1421: Washer, Flat

NSN 5310-01-578-1421 (also written 5310015781421; NIIN 01-578-1421) is a washer, flat in Federal Supply Class 5310, Nuts and Washers. 3 manufacturer part numbers from 3 suppliers are on record. It was last purchased in Oct 2026.

## Identification

- NSN: 5310-01-578-1421 (5310015781421)
- NIIN: 01-578-1421 (015781421)
- Item name: WASHER,FLAT
- Federal Supply Class: [FSC 5310 Nuts and Washers](https://nsnexplorer.com/fsc/5310/)
- Federal Supply Group: [FSG 53](https://nsnexplorer.com/group/53/)
- Acquisition method suffix code: AMSC D: the data needed to compete the part is unavailable or cannot be obtained economically. (observed 2026-11-01)
- Acquisition method code: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| ABNM | THICKNESS | MILLIMETERS NOMINAL 3.0 |
| AAGR | CROSS-SECTIONAL SHAPE STYLE | — |
| CXCY | PART NAME ASSIGNED BY CONTROLLING AGENCY | WSHER FLAT |
| ABMW | PERIPHERAL SHAPE STYLE | — |
| AGAV | END ITEM IDENTIFICATION | 2410-01-565-2599, TRACTOR FULL TRACK LOW SPEED |
| ABMX | CENTER HOLE SHAPE STYLE | — |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 4Y3046 | 11083 | CATERPILLAR INC DIV CATERPILLAR DEFENSE | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 50028101 | K0407 | RBSL WASHINGTON | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 50028101 | U07Z1 | BAES GCS TERRIER SSC 3 PROJECT | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-10-29 | [SPE7LX21D0087/SPE7LX27FA96V](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310015781421) | WASHER, FLAT | ATLANTIC DIVING SUPPLY, INC. DBA ADS | $10.14 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=5310015781421&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310015781421
- 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/5310-01-578-1421/
JSON: https://nsnexplorer.com/api/nsn/5310-01-578-1421.json