# NSN 4820-01-508-4551: Seat, Valve

NSN 4820-01-508-4551 (also written 4820015084551; NIIN 01-508-4551) is a seat, valve in Federal Supply Class 4820, Valves, Nonpowered. 3 manufacturer part numbers from 1 supplier are on record. It was last purchased in Oct 2026.

## Identification

- NSN: 4820-01-508-4551 (4820015084551)
- NIIN: 01-508-4551 (015084551)
- Item name: SEAT,VALVE
- 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 R: the government owns neither the data nor the rights, and obtaining them is judged uneconomical. (observed 2026-10-10)
- Acquisition method code: 3

## Characteristics

| Code | Requirement | Reply |
| --- | --- | --- |
| AAJD | THREAD CLASS | 3A |
| AASA | THREAD LENGTH | SINGLE THREADED PORTION INCHES NOMINAL 0.5625 |
| ABKK | FLANGE DIAMETER | INCHES NOMINAL 5.1250 |
| ADAS | BODY INSIDE DIAMETER | INCHES NOMINAL 4.023 |
| AGAV | END ITEM IDENTIFICATION | 4820-01-198-2855: VALVE, REGULATING |
| AJRF | FLANGE SEAT TO DISK END HEIGHT | INCHES NOMINAL 0.3995 |
| AJRM | UNDER FLANGE HEIGHT | INCHES NOMINAL 0.5625 |
| AJSG | SEAT ANGLE IN DEG | NOMINAL 22.000 |
| AJSH | SEAL ACCOMMODATION TYPE | RECESSED |
| CMLP | THREAD QUANTITY PER INCH | 14 |
| CQJX | NOMINAL THREAD SIZE | SINGLE THREADED PORTION INCHES 4.6250 |
| CQKM | SEATING SURFACE SHAPE | ANGULAR |
| CXCY | PART NAME ASSIGNED BY CONTROLLING AGENCY | SEAT RING |
| FEAT | SPECIAL FEATURES | SEAT RING, MATERIAL IS MONEL, CLASS B-COLD-FORM I. NEXT HIGHER ASSEMBLY IS NSN 4820-01-198-2855, P/N 40737-201: VALVE, REGULATING, FLUID PRESSURE; MATERIAL IS BRONZE; OUTLET PRESSURE RANGE IS 35.0 TO 55.0 PSI. |
| MATT | MATERIAL | SEAT NICKEL ALLOY R-405 |
| MDCL | MATERIAL DOCUMENT AND CLASSIFICATION | SEAT FED SPEC SINGLE MATERIAL RESPONSE QQ-N-281, CLASS B-COLD-FOR- I |
| PRPY | PROPRIETARY CHARACTERISTICS | PACS |
| STYL | STYLE DESIGNATOR | — |
| THSD | THREAD SERIES DESIGNATOR | SINGLE THREADED PORTION UNS |

## Part numbers

| Part number | CAGE | Supplier | Source |
| --- | --- | --- | --- |
| 1880-00 | 55378 | TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 40737-2 | 55378 | TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |
| 40737-2 PC NO 17 | 55378 | TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC | [flis](https://www.dla.mil/Portals/104/Documents/InformationOperations/LogisticsInformationServices/FOIA/PUBLOG/) |

## Price history

Newest first.

| Date | Unit price | Quantity | Supplier | Agency | Source |
| --- | --- | --- | --- | --- | --- |
| 2026-10-07 | $12,448.00 | 1 | PIONEER INDUSTRIES, LLC | — | [record](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820015084551) |

## Contract awards

Newest first.

| Date | Award | Description | Recipient | Amount |
| --- | --- | --- | --- | --- |
| 2026-10-07 | [SPE7MC27V0051](https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820015084551) | SEAT, VALVE | PIONEER INDUSTRIES, LLC | $12,448.00 |

## Sources

- DLA DIBBS RFQs for this NSN: https://www.dibbs.bsm.dla.mil/RFQ/RFQNsn.aspx?value=4820015084551&category=nsn
- DLA DIBBS awards for this NSN: https://www.dibbs.bsm.dla.mil/Awards/AwdRecs.aspx?category=awdnsn&TypeSrch=cq&Value=4820015084551
- 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/4820-01-508-4551/
JSON: https://nsnexplorer.com/api/nsn/4820-01-508-4551.json