# NSN 5310-01-029-2331: Washer, Flat

NSN 5310-01-029-2331 (also written 5310010292331; NIIN 01-029-2331) is a washer, flat in Federal Supply Class 5310, Nuts and Washers. 1 manufacturer part number from 1 supplier is on record. It was last purchased in Oct 2026.

## Identification

- NSN: 5310-01-029-2331 (5310010292331)
- NIIN: 01-029-2331 (010292331)
- 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 G: the government has a complete data package and the rights to use it. (observed 2026-10-20)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAGR | CROSS-SECTIONAL SHAPE STYLE | — |
| AAUB | HOLE DIAMETER | INCHES MINIMUM 0.256 AND INCHES MAXIMUM 0.263 |
| ABMW | PERIPHERAL SHAPE STYLE | — |
| ABMX | CENTER HOLE SHAPE STYLE | — |
| ABNM | THICKNESS | INCHES NOMINAL 0.062 |
| ADAV | OVERALL DIAMETER | INCHES MINIMUM 0.376 AND INCHES MAXIMUM 0.382 |
| CQFM | HARDNESS RATING | ROCKWELL C MINIMUM 27.0 AND ROCKWELL C MAXIMUM 35.0 |
| CRTL | CRITICALITY CODE JUSTIFICATION | ZZZW |
| MATT | MATERIAL | OVERALL STEEL COMP 4140H OR STEEL COMP 4130 |
| SFTT | SURFACE TREATMENT | OVERALL CADMIUM |
| STDC | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | OVERALL FED SPEC SINGLE TREATMENT RESPONSE QQ--416,TYE 2,CLASS 2 |
| ZZZW | DEPARTURE FROM CITED DOCUMENT | AS MODIFIED BY SPECIAL QUALITY CONTROL TESTING FOR MK 48 TORPEDO |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 2505604-5 | 10001 | NAVAIR AND NAVSEA MANAGED ORIGINAL DESIGN ACTIVITY DWG NOT MATERIAL/PARTS SUPPLIER | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-10-19 | [SPE4A627P2701](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310010292331) | WASHER, FLAT | HOOSIER INDUSTRIAL SUPPLY, INC | $11,774.40 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=5310010292331&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310010292331
- 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/5310-01-029-2331/
JSON: https://nsnexplorer.com/api/nsn/5310-01-029-2331.json