Acquisition method (AMC)
1
FSC 4820 × VALVE,SAFETY RELIEF
VALVE,SAFETY RELIEF
4820-00-529-4181 FSC 4820
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.
Open for bid
No open solicitations on record for this NSN right now.
Can you win it?
This item is coded as suitable for competitive acquisition (AMC 1).
Suffix (AMSC)
C
Competition
Coded for competition
AMC 1: suitable for competitive acquisition, second or later time. AMSC C: needs engineering source approval; other sources must qualify first. 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 |
|---|---|
| RENEWABLE SEAT RING TYPE ADZH | PRESSED-IN |
| THREAD DIRECTION AAJF | FIRST END RIGHT-HAND |
| VALVE DISCHARGE FLOW RATE ADSY | GALLONS PER MINUTE 7.0 |
| CONNECTION TYPE AWLS | FIRST END THREADED INTERNAL TUBE |
| MATERIAL MATT | SEAT STEEL |
| NOMINAL THREAD SIZE CQJX | FIRST END INCHES 0.562 |
| OPENING PRESSURE SETTING CSDC | POUNDS PER SQUARE INCH 3500.0 |
| SUPPLEMENTARY FEATURES SUPP | APPL TO ACFT,TYPE C-135 |
| THREAD SERIES DESIGNATOR THSD | FIRST END UNF |
| FEATURES PROVIDED CBBL | PRESSURE TIGHT OUTLET SIDE |
| NOMINAL OUTSIDE DIAMETER TUBE ACCOMMODATED CWFD | FIRST END INCHES 0.375 |
| MATERIAL MATT | BODY ALUMINUM ALLOY |
| DISK LOADING METHOD ADSU | SPRING |
| THREAD CLASS AAJD | 3B |
| THREAD QUANTITY PER INCH CMLP | 18 |
| VALVE OPERATION METHOD AQLR | AUTOMATIC |
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 |
|---|---|---|
| 10-3000-7 | 81205 | THE BOEING COMPANY DIV DEFENSE |
| 11010-1 | 75201 | BAHR MACHINE COMPANY INC DBA BAHR MACHINE CO |
| A50082CD6 | 81982 | HYDRO-AIRE AEROSPACE CORP |
| M9029DCD001 | 6L817 | NATIONAL MACHINE COMPANY DBA NMG AEROSPACE |
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
$18,421.0526
Purchases
1
Total spend
$350,000
Sep 16, 2026
Last purchased
3 · 3.0/yr
Purchase records
$725,587
Total demand
$18,421.0526
Latest unit price
Purchase history
| Awarded | Qty | Unit price | Total | Supplier | Agency | Source |
|---|---|---|---|---|---|---|
| Sep 16, 2026 | 19 | $18,421.0526 | $350,000 | BAHR MACHINE COMPANY INC DBA BAHR MACHINE CO (75201) | 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 |
|---|---|---|---|---|
| Aug 31, 2026 | SPE7MC26V4215 ↗ | TRANSAERO, INC. | — | $25,587 |
| Sep 16, 2026 | SPE7M226D60LM ↗ | BAHR MACHINE COMPANY INC DBA BAHR MACHINE CO | — | $350,000 |
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
BAHR MACHINE COMPANY INC DBA BAHR MACHINE CO
last award Sep 2026
HYDRO-AIRE AEROSPACE CORP
no award yet
no awards on record
Listed source NATIONAL MACHINE COMPANY DBA NMG AEROSPACE
no award yet
no awards on record
Listed source THE BOEING COMPANY DIV DEFENSE
no award yet
no awards on record
Listed source BAHR MACHINE COMPANY INC DBA BAHR MACHINE CO won the only award on record.
| Solicitation | Issued | Closes / closed | Qty | Status | |
|---|---|---|---|---|---|
| SPE7M2-26-U-0356 | Aug 28, 2026 | Sep 11, 2026 | 19 | 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: 2026-10-27.
- Full methodology →
Cite this page
Citation
NSN Explorer. "VALVE,SAFETY RELIEF." nsnexplorer.com, https://nsnexplorer.com/nsn/4820-00-529-4181/. Data as of November 7, 2026.
Link
https://nsnexplorer.com/nsn/4820-00-529-4181/