# NSN 4820-00-529-4181: Valve, Safety Relief

NSN 4820-00-529-4181 (also written 4820005294181; NIIN 00-529-4181) 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: 4820-00-529-4181 (4820005294181)
- NIIN: 00-529-4181 (005294181)
- 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 C: needs engineering source approval; other sources must qualify first. (observed 2026-10-10)
- Acquisition method code: 1

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| ADZH | RENEWABLE SEAT RING TYPE | PRESSED-IN |
| AAJF | THREAD DIRECTION | FIRST END RIGHT-HAND |
| ADSY | VALVE DISCHARGE FLOW RATE | GALLONS PER MINUTE 7.0 |
| AWLS | CONNECTION TYPE | FIRST END THREADED INTERNAL TUBE |
| MATT | MATERIAL | SEAT STEEL |
| CQJX | NOMINAL THREAD SIZE | FIRST END INCHES 0.562 |
| CSDC | OPENING PRESSURE SETTING | POUNDS PER SQUARE INCH 3500.0 |
| SUPP | SUPPLEMENTARY FEATURES | APPL TO ACFT,TYPE C-135 |
| THSD | THREAD SERIES DESIGNATOR | FIRST END UNF |
| CBBL | FEATURES PROVIDED | PRESSURE TIGHT OUTLET SIDE |
| CWFD | NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED | FIRST END INCHES 0.375 |
| MATT | MATERIAL | BODY ALUMINUM ALLOY |
| ADSU | DISK LOADING METHOD | SPRING |
| AAJD | THREAD CLASS | 3B |
| CMLP | THREAD QUANTITY PER INCH | 18 |
| AQLR | VALVE OPERATION METHOD | AUTOMATIC |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 10-3000-7 | 81205 | THE BOEING COMPANY DIV DEFENSE | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 11010-1 | 75201 | BAHR MACHINE COMPANY INC DBA BAHR MACHINE CO | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| A50082CD6 | 81982 | HYDRO-AIRE AEROSPACE CORP | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| M9029DCD001 | 6L817 | NATIONAL MACHINE COMPANY DBA NMG AEROSPACE | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Price history

Newest first.

| Date | Unit price | Quantity | Supplier | Agency | Source |
| --- | --- | --- | --- | --- | --- |
| 2026-09-16 | $18,421.0526 | 19 | BAHR MACHINE COMPANY INC DBA BAHR MACHINE CO | — | [record](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820005294181) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-09-16 | [SPE7M226D60LM](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820005294181) | VALVE, SAFETY RELIEF | BAHR MACHINE COMPANY INC DBA BAHR MACHINE CO | $350,000.00 |
| 2026-08-31 | [SPE7MC26V4215](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820005294181) | VALVE, SAFETY RELIEF | TRANSAERO, INC. | $25,586.82 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820005294181&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820005294181
- 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/4820-00-529-4181/
JSON: https://nsnexplorer.com/api/nsn/4820-00-529-4181.json