Acquisition method (AMC)
3
FSC 4820 × VALVE,SAFETY RELIEF
VALVE,SAFETY RELIEF
4820-00-973-8345 FSC 4820
NSN 4820-00-973-8345 (also written 4820009738345; NIIN 00-973-8345) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 2 manufacturer part numbers from 2 suppliers 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)
L
Competition
Coded for a named source
AMC 3: buy directly from the actual manufacturer, second or later time. AMSC L: annual buy value is below the screening threshold. 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 DIRECTION AAJF | FIRST END RIGHT-HAND |
| DISK LOADING METHOD ADSU | SPRING |
| OPERATING PRESSURE CQQF | SINGLE RESPONSE POUNDS PER SQUARE INCH (PSI) MAXIMUM 200.0 |
| OPENING PRESSURE SETTING CSDC | POUNDS PER SQUARE INCH 4.0 |
| SPECIAL FEATURES FEAT | POP-OFF TYPE |
| MATERIAL MATT | OVERALL COPPER ALLOY |
| MEDIA FOR WHICH DESIGNED MEDA | FIFTH RESPONSE HYDROGEN |
| MEDIA FOR WHICH DESIGNED MEDA | FIRST RESPONSE AIR |
| FLOW CONTROL DEVICE ADQU | DISK |
| NOMINAL PIPE SIZE ACCOMMODATED AAAR | FIRST END INCHES 0.125 |
| MAXIMUM OPERATING TEMP AEHZ | FIRST RESPONSE FAHRENHEIT -40.0 |
| MAXIMUM OPERATING TEMP AEHZ | SECOND RESPONSE FAHRENHEIT 250.0 |
| CONNECTION STYLE AHNC | — |
| VALVE OPERATION METHOD AQLR | AUTOMATIC |
| CONNECTION TYPE AWLS | FIRST END THREADED EXTERNAL PIPE |
| NOMINAL THREAD SIZE CQJX | FIRST END INCHES 0.125 |
| MEDIA FOR WHICH DESIGNED MEDA | THIRD RESPONSE AMMONIA, GASEOUS |
| STYLE DESIGNATOR STYL | — |
| THREAD SERIES DESIGNATOR THSD | FIRST END NPT |
| MEDIA FOR WHICH DESIGNED MEDA | SECOND RESPONSE ACETYLENE |
| MEDIA FOR WHICH DESIGNED MEDA | FOURTH RESPONSE REFRIGERANT 12 |
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 |
|---|---|---|
| 381-1040P7 | 49956 | RAYTHEON COMPANY DIV CORP |
| 559B-1M-4 | 91816 | CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE 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
$148.90
Purchases
1
Total spend
$1,191
Oct 1, 2026
Last purchased
2 · 2.0/yr
Purchase records
$2,382
Total demand
$148.90
Latest unit price
Purchase history
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 1, 2026 | SPE7M127V0050 ↗ | — | — | $1,191 |
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
CAGE 07A78
last award Oct 2026
CIRCOR AEROSPACE, INC. DBA CIRCOR AEROSPACE INC
no award yet
no awards on record
Listed source RAYTHEON COMPANY DIV CORP
no award yet
no awards on record
Listed source CAGE 07A78 won the only award on record. CAGE 07A78 won without being a listed source.
| Solicitation | Issued | Closes / closed | Qty | Status | |
|---|---|---|---|---|---|
| SPE7MC-26-T-171S | Aug 7, 2026 | Aug 17, 2026 | 8 | 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: 2026-10-04.
- Full methodology →
Cite this page
Citation
NSN Explorer. "VALVE,SAFETY RELIEF." nsnexplorer.com, https://nsnexplorer.com/nsn/4820-00-973-8345/. Data as of November 7, 2026.
Link
https://nsnexplorer.com/nsn/4820-00-973-8345/