# NSN 5310-01-304-8739: Washer, Recessed

NSN 5310-01-304-8739 (also written 5310013048739; NIIN 01-304-8739) is a washer, recessed in Federal Supply Class 5310, Nuts and Washers. 7 manufacturer part numbers from 7 suppliers are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 5310-01-304-8739 (5310013048739)
- NIIN: 01-304-8739 (013048739)
- Item name: WASHER,RECESSED
- 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 C: needs engineering source approval; other sources must qualify first. (observed 2026-10-10)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAUB | HOLE DIAMETER | INCHES MINIMUM 0.501 AND INCHES MAXIMUM 0.505 |
| ABKV | OUTSIDE DIAMETER | INCHES MINIMUM 0.922 AND INCHES MAXIMUM 0.932 |
| ABMD | RECESS DIAMETER | INCHES MINIMUM 0.614 AND INCHES MAXIMUM 0.624 |
| ABPX | MATERIAL THICKNESS | INCHES MINIMUM 0.071 AND INCHES MAXIMUM 0.085 |
| CSTM | RECESS ANGLE | DEGREES MINIMUM 80.0 AND DEGREES MAXIMUM 100.0 |
| MATT | MATERIAL | OVERALL IRON ALLOY 660 OR NICKEL ALLOY 502 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | OVERALL ASSN STD 1ST MATERIAL RESPONSE A-S 5525 OR ASSN STD 1ST MATERIAL RESPONSE A-S 5737 OR ASSN STD 2ND MATERIAL RESPONSE A-S 5596 OR ASSN STD 2ND MATERIAL RESPONSE A-S 5597 OR ASSN STD 2ND MATERIAL RESPONSE A-S 5662 |
| SFTT | SURFACE TREATMENT | OVERALL ALUMINUM ALLOY |
| STDC | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | OVERALL ASSN STD SINGLE TREATMENT RESPONSE NAS 4006 |
| STYL | STYLE DESIGNATOR | — |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 03A257C8A | 1W025 | NORTHROP GRUMMAN SYSTEMS CORP DBA NORTHROP GRUMMAN COMPUTING SYSTEMS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 03A257C8A | 76823 | NORTHROP GRUMMAN SYSTEMS CORPORATION DBA NORTHROP GRUMMAN IS DIV NORTHROP GRUMMAN AERONAUTICS SYSTEMS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| AS19879C8A | 10630 | ANILLO INDUSTRIES LLC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| MM118C8A | 58009 | MOELLER MANUFACTURING & SUPPLY, LLC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| NS202860C8A | 80539 | SPS TECHNOLOGIES, LLC DBA AEROSPACE FASTENERS GROUP DIV AEROSPACE - SANTA ANA | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| VN948BF8C | 5M902 | HOWMET GLOBAL FASTENING SYSTEMS INC. DIV VOI-SHAN PRODUCTS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| VN948BF8C | 92215 | HOWMET GLOBAL FASTENING SYSTEMS INC DIV TORRANCE OPERATIONS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-28 | [SPE4A626PYY80](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310013048739) | WASHER, RECESSED | TAB HARDWARE, INC. DBA TAB HARDWARE INC | $999.78 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=5310013048739&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310013048739
- 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/5310-01-304-8739/
JSON: https://nsnexplorer.com/api/nsn/5310-01-304-8739.json