FSC 4820 × VALVE,SAFETY RELIEF

VALVE,SAFETY RELIEF

4820-01-273-3643 FSC 4820

NSN 4820-01-273-3643 (also written 4820012733643; NIIN 01-273-3643) is a valve, safety relief in Federal Supply Class 4820, Valves, Nonpowered. 2 manufacturer part numbers from 2 suppliers are on record. The government has 1 open solicitation for it.

Open for bid

1 open solicitation on record right now — quantity, close date, and where to submit.

Solicitation	Qty	Status
SPE7MC-27-T-0219	3	Closes today	Bid →

Can you win it?

This item is coded to be bought directly from the actual manufacturer (AMC 3).

Acquisition method (AMC)

Suffix (AMSC)

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
FLOW CONTROL DEVICE ADQU	DISK
BOLT HOLE QUANTITY AECS	4
VALVE OPERATION METHOD AQLR	AUTOMATIC
FLANGE SHAPE ARKN	ALL ENDS ROUND WITH HOLES
CONNECTION TYPE AWLS	ALL ENDS FLANGE
VALVE SIZE CCFG	INCHES 0.500
ADJUSTABLE PRESSURE RANGE CQCY	POUNDS PER SQUARE INCH 48.0 TO 59.0
NOMINAL OUTSIDE DIAMETER CWCD	ALL ENDS INCHES 3.500
FACE TO FACE DISTANCE CWCF	INCHES 1.750
NOMINAL THICKNESS CWCK	ALL ENDS INCHES 0.437
BOLT HOLE NOMINAL DIAMETER CWCQ	ALL ENDS INCHES 0.625
BOLT CIRCLE NOMINAL DIAMETER CWCT	ALL ENDS INCHES 2.375
FLANGE FACE DESIGN CWDF	ALL ENDS RAISED STRAIGHT
RAISED FACE NOMINAL HEIGHT CWDH	ALL ENDS INCHES 0.062
RAISED FACE NOMINAL DIAMETER CWDL	ALL ENDS INCHES 1.375
MATERIAL MATT	BODY STEEL
MATERIAL MATT	FLOW CONTROL DEVICE STEEL CORROSION RESISTING
MATERIAL MATT	STEM STEEL CORROSION RESISTING
MATERIAL MATT	SEAT STEEL CORROSION RESISTING
STYLE DESIGNATOR STYL	—

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
R10AD5D511-CS1 AND D50748	11859	HUNT VALVE COMPANY, INC.
R10AD5D511-CS1 AND D50748	34889	HUNT VALVE COMPANY INC DBA UNION FLONETICS

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

Total spend

—

Last purchased

—

Purchase records

—

Total demand

—

Latest award total

Compare with other items

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.

No related contract actions on record.

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.

Solicitation	Issued	Closes / closed	Qty	Status
SPE7MC-27-T-0219	Oct 8, 2026	Oct 19, 2026	3	Open	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.
Full methodology →

Cite this page

Citation

NSN Explorer. "VALVE,SAFETY RELIEF." nsnexplorer.com, https://nsnexplorer.com/nsn/4820-01-273-3643/. Data as of October 19, 2026.

Link

https://nsnexplorer.com/nsn/4820-01-273-3643/