Acquisition method (AMC)
3
FSC 4820 × SEAT,VALVE
SEAT,VALVE
4820-01-508-4551 FSC 4820
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.
Open for bid
No open solicitations on record for this NSN right now.
Can you win it?
This item is coded to be bought directly from the actual manufacturer (AMC 3).
Suffix (AMSC)
R
Competition
Coded for a named source
AMC 3: buy directly from the actual manufacturer, second or later time. AMSC R: the government owns neither the data nor the rights, and obtaining them is judged uneconomical. The codes describe the item's status on record, not any one solicitation. What the codes mean
What it is — can you make it?
Dimensions, the FLIS specification requirements, and the manufacturer part numbers already qualified against this NSN.
Specifications
From the federal catalog (DLA FLIS / PUB LOG) — what your part has to meet. Cited specification documents can be looked up in ASSIST Quick Search ↗, DoD's public spec repository — copy the document number in.
| Requirement | Value |
|---|---|
| THREAD CLASS AAJD | 3A |
| THREAD LENGTH AASA | SINGLE THREADED PORTION INCHES NOMINAL 0.5625 |
| FLANGE DIAMETER ABKK | INCHES NOMINAL 5.1250 |
| BODY INSIDE DIAMETER ADAS | INCHES NOMINAL 4.023 |
| END ITEM IDENTIFICATION AGAV | 4820-01-198-2855: VALVE, REGULATING |
| FLANGE SEAT TO DISK END HEIGHT AJRF | INCHES NOMINAL 0.3995 |
| UNDER FLANGE HEIGHT AJRM | INCHES NOMINAL 0.5625 |
| SEAT ANGLE IN DEG AJSG | NOMINAL 22.000 |
| SEAL ACCOMMODATION TYPE AJSH | RECESSED |
| THREAD QUANTITY PER INCH CMLP | 14 |
| NOMINAL THREAD SIZE CQJX | SINGLE THREADED PORTION INCHES 4.6250 |
| SEATING SURFACE SHAPE CQKM | ANGULAR |
| PART NAME ASSIGNED BY CONTROLLING AGENCY CXCY | SEAT RING |
| SPECIAL FEATURES FEAT | 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. |
| MATERIAL MATT | SEAT NICKEL ALLOY R-405 |
| MATERIAL DOCUMENT AND CLASSIFICATION MDCL | SEAT FED SPEC SINGLE MATERIAL RESPONSE QQ-N-281, CLASS B-COLD-FOR- I QQ-N-281 |
| PROPRIETARY CHARACTERISTICS PRPY | PACS |
| STYLE DESIGNATOR STYL | — |
| THREAD SERIES DESIGNATOR THSD | SINGLE THREADED PORTION UNS |
Manufacturer part numbers
Commercial part numbers cross-referenced to this NSN in the federal catalog — the parts that have been accepted as satisfying this stock number, and who makes them.
| Part number | CAGE | Manufacturer |
|---|---|---|
| 1880-00 | 55378 | TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC |
| 40737-2 | 55378 | TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC |
| 40737-2 PC NO 17 | 55378 | TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC |
What it pays — so you can quote
The government's own price and demand record for this NSN — what past awards cleared at, so you know where to land your quote.
Latest unit price
$12,448.00
Purchases
1
Total spend
$12,448
Oct 7, 2026
Last purchased
2 · 2.0/yr
Purchase records
$24,896
Total demand
$12,448.00
Latest unit price
Purchase history
| Awarded | Qty | Unit price | Total | Supplier | Agency | Source |
|---|---|---|---|---|---|---|
| Oct 7, 2026 | 1 | $12,448.00 | $12,448 | PIONEER INDUSTRIES, LLC (66200) | Unknown | Source ↗ |
Related contract actions
Contract action totals, not unit prices — obligation amounts from USAspending for related awards, shown for context only. These do not appear on the price chart above.
| Action date | Award # | Recipient | Agency | Obligation |
|---|---|---|---|---|
| Oct 7, 2026 | SPE7MC27V0051 ↗ | PIONEER INDUSTRIES, LLC | — | $12,448 |
Demand history
Every solicitation we've indexed for this NSN, open and closed — 1 on record. Closed RFQs (expired, cancelled, or awarded) stay here as a record of past demand; they never get removed.
Who wins this item
Does one supplier win this every time, and are the winners on the listed-source list? One dot per award.
- Award in the last 2 years
- Older award
PIONEER INDUSTRIES, LLC
last award Oct 2026
TRAC REGULATOR CO., INC. DBA TRAC REGULATOR CO INC
no award yet
no awards on record
Listed source PIONEER INDUSTRIES, LLC won the only award on record. PIONEER INDUSTRIES, LLC won without being a listed source.
| Solicitation | Issued | Closes / closed | Qty | Status | |
|---|---|---|---|---|---|
| SPE7MC-26-T-298J | Sep 25, 2026 | Oct 5, 2026 | 1 | Expired | View at DIBBS → |
Open RFQs on DIBBS → DIBBS award history ↗
About this data
- Unit prices: DLA DIBBS award records — every row links to its government record.
- AMSC: latest observed value from DIBBS solicitation history as of Oct 10, 2026.
- Contract action totals: USAspending, context only.
- Data last refreshed: 2026-10-08.
- Full methodology →
Cite this page
Citation
NSN Explorer. "SEAT,VALVE." nsnexplorer.com, https://nsnexplorer.com/nsn/4820-01-508-4551/. Data as of October 19, 2026.
Link
https://nsnexplorer.com/nsn/4820-01-508-4551/