# NSN 5310-01-097-8021: Washer, Flat

NSN 5310-01-097-8021 (also written 5310010978021; NIIN 01-097-8021) 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 Aug 2026.

## Identification

- NSN: 5310-01-097-8021 (5310010978021)
- NIIN: 01-097-8021 (010978021)
- 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 C: needs engineering source approval; other sources must qualify first. (observed 2026-11-04)
- Acquisition method code: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAGR | CROSS-SECTIONAL SHAPE STYLE | — |
| AAUB | HOLE DIAMETER | INCHES MINIMUM 0.1567 AND INCHES MAXIMUM 0.1602 |
| ABMW | PERIPHERAL SHAPE STYLE | — |
| ABMX | CENTER HOLE SHAPE STYLE | — |
| ABNM | THICKNESS | INCHES MINIMUM 0.0095 AND INCHES MAXIMUM 0.0105 |
| ADAV | OVERALL DIAMETER | INCHES MINIMUM 0.210 AND INCHES MAXIMUM 0.220 |
| CQFM | HARDNESS RATING | VICKERS OR FIRTH DIAMOND PYRAMID MINIMUM 302.0 AND VICKERS OR FIRTH DIAMOND PYRAMID MAXIMUM 372.0 |
| MATT | MATERIAL | OVERALL STEEL COMP 410 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | OVERALL ASSN STD SINGLE MATERIAL RESPONSE A-S 5504 OR ASSN STD SINGLE MATERIAL RESPONSE A-S 5612 |
| ZZZK | SPECIFICATION/STANDARD DATA | MANUFACTURERS STANDARD 73030-588941 |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 588941-157 | 73030 | HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-08-17 | [SPE4A125G0027/SPE4A526F7901](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310010978021) | WASHER, FLAT | HAMILTON SUNDSTRAND CORPORATION DBA COLLINS AEROSPACE | $2,080.27 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=5310010978021&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310010978021
- 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/5310-01-097-8021/
JSON: https://nsnexplorer.com/api/nsn/5310-01-097-8021.json