# NSN 5310-00-549-9526: Nut, Self-Locking, Extended Washer

NSN 5310-00-549-9526 (also written 5310005499526; NIIN 00-549-9526) is a nut, self-locking, extended washer in Federal Supply Class 5310, Nuts and Washers. 2 manufacturer part numbers from 2 suppliers are on record. It was last purchased in Oct 2026.

## Identification

- NSN: 5310-00-549-9526 (5310005499526)
- NIIN: 00-549-9526 (005499526)
- Item name: NUT,SELF-LOCKING,EXTENDED WASHER
- 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 B: must be bought from the sources named on a source control or selected item drawing. (observed 2026-10-23)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAJD | THREAD CLASS | 3B |
| MATT | MATERIAL | OVERALL NICKEL ALLOY |
| AAVX | WASHER OUTSIDE DIAMETER | INCHES MAXIMUM 0.495 |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| ASDB | WIDTH ACROSS FLATS | INCHES MINIMUM 0.430 AND INCHES MAXIMUM 0.439 |
| BZRR | THREAD SERIES | UNIFIED NATIONAL JOINT FINE (UNJF) |
| AAUM | LOCKING FEATURE | PREVAILING TORQUE ALL METAL DESIGN |
| STDC | SURFACE TREATMENT DOCUMENT AND CLASSIFICATION | OVERALL MFR REF SINGLE TREATMENT RESPONSE 410,ELASTIC STO NUT COR |
| PRMT | PRECIOUS MATERIAL | SILVER |
| ABKW | OVERALL HEIGHT | INCHES MAXIMUM 0.473 |
| ACTA | NUT STYLE | — |
| CRSQ | COUNTERSINK ANGLE | NUT DEGREES NOMINAL 90.0 |
| CMLP | THREAD QUANTITY PER INCH | 24 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | OVERALL ASSN STD SINGLE MATERIAL RESPONSE A-S 5709 |
| CQJX | NOMINAL THREAD SIZE | INCHES 0.312 |
| SFTT | SURFACE TREATMENT | OVERALL SILVER |
| ADEM | WASHER THICKNESS | INCHES MINIMUM 0.063 |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 4037829 | 77445 | RTX CORPORATION DBA PRATT & WHITNEY DIV PRATT &WHITNEY | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 75206-524 | 56878 | SPS TECHNOLOGIES, LLC DBA PB FASTENERS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-10-20 | [SPE4A625V408N](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310005499526) | NUT, SELF-LOCKING, EX | — | $7,960.00 |
| 2026-08-20 | [SPE4A626V328N](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310005499526) | NUT, SELF-LOCKING, EX | — | $5,492.40 |
| 2026-08-20 | [SPE4A626V326B](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310005499526) | NUT, SELF-LOCKING, EX | — | $756.20 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=5310005499526&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5310005499526
- 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/5310-00-549-9526/
JSON: https://nsnexplorer.com/api/nsn/5310-00-549-9526.json