Acquisition method (AMC)
1
FSC 4820 × VALVE,SAFETY RELIEF
VALVE,SAFETY RELIEF
4820-01-478-0990 FSC 4820
NSN 4820-01-478-0990 (also written 4820014780990; NIIN 01-478-0990) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 5 manufacturer part numbers from 5 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 |
|---|---|
| THREAD DIRECTION AAJF | ALL ENDS RIGHT-HAND |
| FLOW CONTROL DEVICE ADQU | POPPET |
| BONNET TYPE ADSR | INSIDE SPRING |
| BONNET ATTACHMENT METHOD ADST | THREADED |
| DISK LOADING METHOD ADSU | SPRING |
| CONNECTION STYLE AHNC | — |
| VALVE OPERATION METHOD AQLR | AUTOMATIC |
| CONNECTION TYPE AWLS | SECOND END THREADED INTERNAL PIPE |
| CONNECTION TYPE AWLS | FIRST END THREADED EXTERNAL PIPE |
| THREAD QUANTITY PER INCH CMLP | 18 |
| ADJUSTABLE PRESSURE RANGE CQCY | POUNDS PER SQUARE INCH 3000.0 TO 4000.0 |
| NOMINAL THREAD SIZE CQJX | FIRST END INCHES 0.250 |
| NOMINAL THREAD SIZE CQJX | SECOND END INCHES 0.250 |
| OPENING PRESSURE SETTING CSDC | POUNDS PER SQUARE INCH 3600.0 |
| MATERIAL MATT | BODY STEEL COMP 316 |
| MATERIAL DOCUMENT AND CLASSIFICATION MDCL | BODY ASSN STD ALL MATERIAL RESPONSES AST-A266, CO- 316 |
| STYLE DESIGNATOR STYL | — |
| THREAD SERIES DESIGNATOR THSD | SECOND END NPT |
| THREAD SERIES DESIGNATOR THSD | FIRST END NPT |
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 |
|---|---|---|
| 2200004 | Z4W93 | ARA MARINE PTY LTD |
| 4726-220-RVBA | Z3287 | HIFRASER PTY LTD |
| 515-856 3600 PSI | 28953 | RIX INDUSTRIES |
| SS-4R3A5-F | 18034 | NUPRO CO |
| SS-4R3A5-F | 3T9T9 | SWAGELOK CO |
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
—
Purchases
0
Total spend
—
Sep 1, 2026
Last purchased
1 · 1.0/yr
Purchase records
$6,465
Total demand
$6,465
Latest award total
Purchase history
No priced purchases on record for this NSN yet.
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 |
|---|---|---|---|---|
| Sep 1, 2026 | SPE7MC26V4255 ↗ | III WILLIAMS LLC | — | $6,465 |
Demand history
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
III WILLIAMS LLC
last award Sep 2026
ARA MARINE PTY LTD
no award yet
no awards on record
Listed source HIFRASER PTY LTD
no award yet
no awards on record
Listed source NUPRO CO
no award yet
no awards on record
Listed source RIX INDUSTRIES
no award yet
no awards on record
Listed source SWAGELOK CO
no award yet
no awards on record
Listed source III WILLIAMS LLC won the only award on record. III WILLIAMS LLC won without being a listed source.
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 27, 2026.
- Contract action totals: USAspending, context only.
- Data last refreshed: 2026-10-26.
- Full methodology →
Cite this page
Citation
NSN Explorer. "VALVE,SAFETY RELIEF." nsnexplorer.com, https://nsnexplorer.com/nsn/4820-01-478-0990/. Data as of November 7, 2026.
Link
https://nsnexplorer.com/nsn/4820-01-478-0990/