# NSN 5305-00-637-6921: Screw, Cap, Socket Head

NSN 5305-00-637-6921 (also written 5305006376921; NIIN 00-637-6921) is a screw, cap, socket head in Federal Supply Class 5305, Screws. 4 manufacturer part numbers from 3 suppliers are on record. It was last purchased in Oct 2026.

## Identification

- NSN: 5305-00-637-6921 (5305006376921)
- NIIN: 00-637-6921 (006376921)
- Item name: SCREW,CAP,SOCKET HEAD
- Federal Supply Class: [FSC 5305 Screws](https://nsnexplorer.com/fsc/5305/)
- Federal Supply Group: [FSG 53](https://nsnexplorer.com/group/53/)
- Acquisition method suffix code: AMSC R: the government owns neither the data nor the rights, and obtaining them is judged uneconomical. (observed 2026-10-10)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAJF | THREAD DIRECTION | RIGHT-HAND |
| ASDB | WIDTH ACROSS FLATS | INCHES MINIMUM 0.125 AND INCHES MAXIMUM 0.127 |
| ASXK | HOLE QUANTITY | 4 |
| SFTT | SURFACE TREATMENT | OVERALL PASSIVATE |
| AAJD | THREAD CLASS | 3A |
| ABQZ | INTERNAL DRIVE STYLE | — |
| AASA | THREAD LENGTH | INCHES MINIMUM 0.258 |
| MATT | MATERIAL | OVERALL STEEL COMP 416SE OR STEEL COMP 303 OR STEEL COMP 303 PLUS X |
| CQFM | HARDNESS RATING | OVERALL ROCKWELL C MINIMUM 26.0 AND ROCKWELL C MAXIMUM 34.0 |
| CRHC | HOLE CONFIGURATION STYLE | — |
| AASU | HEAD HEIGHT | INCHES MINIMUM 0.160 AND INCHES MAXIMUM 0.164 |
| AAUB | HOLE DIAMETER | INCHES NOMINAL 0.031 |
| THSD | THREAD SERIES DESIGNATOR | UNIFIED NATIONAL COARSE (UNC) |
| AASB | FASTENER LENGTH | INCHES NOMINAL 0.320 |
| AHYM | NOMINAL THREAD DIAMETER | INCHES 0.164 |
| AASL | HEAD DIAMETER | INCHES MINIMUM 0.265 AND INCHES MAXIMUM 0.270 |
| AASK | HEAD STYLE | — |
| BQDM | HOLE TYPE | DRILLED |
| CMLP | THREAD QUANTITY PER INCH | 32 |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 29577 | 11599 | TRIUMPH ENGINE CONTROL SYSTEMS LLC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 333S605 | 06840 | BENDIX CORP THE | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 333S605 | 06848 | HONEYWELL INTERNATIONAL INC DIV AEROSPACE-SOUTH BEND (BENDIX DR) | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 33S605 | 06848 | HONEYWELL INTERNATIONAL INC DIV AEROSPACE-SOUTH BEND (BENDIX DR) | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-10-06 | [SPE4A627P1519](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5305006376921) | SCREW, CAP, SOCKET HEAD | ALAMO AIRCRAFT, LTD. | $560.00 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=5305006376921&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=5305006376921
- 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/5305-00-637-6921/
JSON: https://nsnexplorer.com/api/nsn/5305-00-637-6921.json