# NSN 4820-01-621-6774: Valve, Safety Relief

NSN 4820-01-621-6774 (also written 4820016216774; NIIN 01-621-6774) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 4 manufacturer part numbers from 4 suppliers are on record. It was last purchased in Sep 2026.

## Identification

- NSN: 4820-01-621-6774 (4820016216774)
- NIIN: 01-621-6774 (016216774)
- Item name: VALVE,SAFETY RELIEF
- Federal Supply Class: [FSC 4820 Valves, Nonpowered](https://nsnexplorer.com/fsc/4820/)
- Federal Supply Group: [FSG 48](https://nsnexplorer.com/group/48/)
- Acquisition method suffix code: AMSC D: the data needed to compete the part is unavailable or cannot be obtained economically. (observed 2026-10-20)
- Acquisition method code: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| MATT | MATERIAL | BODY STEEL CORROSION RESISTING |
| STYL | STYLE DESIGNATOR | — |
| AEHZ | MAXIMUM OPERATING TEMP | SINGLE RESPONSE FAHRENHEIT 375.0 |
| AHNC | CONNECTION STYLE | — |
| AKGF | NOMINAL WIDTH | ALL ENDS INCHES 0.875 |
| FEAT | SPECIAL FEATURES | FORMER NAME: NRP,CHECK VALVE(BYP |
| CXCY | PART NAME ASSIGNED BY CONTROLLING AGENCY | CHECK VALVE (BYPASS) |
| ADSU | DISK LOADING METHOD | SPRING |
| CQQF | OPERATING PRESSURE | SECOND RESPONSE POUNDS PER SQUARE INCH (PSI) MAXIMUM 3000.0 |
| ADST | BONNET ATTACHMENT METHOD | INTEGRAL |
| CQQF | OPERATING PRESSURE | FIRST RESPONSE POUNDS PER SQUARE INCH (PSI) MAXIMUM 2185.0 |
| THSD | THREAD SERIES DESIGNATOR | ALL ENDS NPT |
| ADQU | FLOW CONTROL DEVICE | POPPET |
| ADSR | BONNET TYPE | INSIDE SPRING |
| CQCY | ADJUSTABLE PRESSURE RANGE | POUNDS PER SQUARE INCH 3.0 TO 50.0 |
| CQJX | NOMINAL THREAD SIZE | ALL ENDS INCHES 0.500 |
| SUPP | SUPPLEMENTARY FEATURES | SET AT 40 PSI +/- 2 PSI; O-RINGS: FLUOROCARBON FKM |
| AAJF | THREAD DIRECTION | ALL ENDS RIGHT-HAND |
| AWLS | CONNECTION TYPE | ALL ENDS THREADED EXTERNAL PIPE |
| AKGG | NOMINAL LENGTH | ALL ENDS INCHES 2.56 |
| AQLR | VALVE OPERATION METHOD | AUTOMATIC |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 1913732 | D1253 | TKMS GMBH | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 3890AS000637-01 | 30003 | NAVAL AIR SYSTEMS COMMAND MANAGED ORIGINAL DESIGN ACTIVITY NOT MATERIAL/PARTS SUPPLIER | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 3890AS000637-01 | 4XB60 | GENERAL ATOMICS DIV GENERAL ATOMICS ELECTROMAGNETIC SYSTEMS | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| SS-8CPA2-3 | 3T9T9 | SWAGELOK CO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-16 | [SPE7MC26P3140](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820016216774) | VALVE, SAFETY RELIEF | GENERAL ATOMICS DBA GENERAL ATOMICS CORP | $7,376.18 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820016216774&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820016216774
- 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/4820-01-621-6774/
JSON: https://nsnexplorer.com/api/nsn/4820-01-621-6774.json