PartsTable TECHNICAL DATA SHEET

NSN 4820-01-184-4490Government record, cited

Tailpiece, Valve4820-01-184-4490

NSN 4820-01-184-4490 · NIIN 011844490

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-184-4490 · 4820011844490 · NIIN 011844490 · 01-184-4490 · FSC 4820 Valves, Nonpowered · 2640-650 ASSEMBLY D PIECE 3 · 2640-650 · SS-845-2109894 · SS-845-2109894 ASSY D PC 3

Nearby stock numbers ← 4820-01-184-4458 Body, Selector Valve · 4820-01-184-4493 Cover, Valve →

4820-01-184-4490 — Valves, Nonpowered

Features

Tailpiece,valve — FSC 4820
Design Type: ANGLE
Valve Model Number for Which Designed: 2640-650 ASSY D
Connection Type: FLANGE, ROUND W/HOLES
Valve Size for Which Designed: 5.000 INCHES IN
Flange Diameter: 13.500 INCHES AND 9.750 INCHES IN
Material: NICKEL ALLOY

Identification

NSN: 4820-01-184-4490
NIIN: 011844490
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Tailpiece,valve, cataloged under National Stock Number 4820-01-184-4490, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-184-4490
Item Name	Tailpiece,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Design Type	ANGLE
Valve Model Number for Which Designed	2640-650 ASSY D
Connection Type	FLANGE, ROUND W/HOLES
Valve Size for Which Designed	5.000 INCHES IN
Flange Diameter	13.500 INCHES AND 9.750 INCHES IN
Material	NICKEL ALLOY

Lifecycle & Compliance

Acquisition Status	ACTIVE
DEMIL Code	DEMIL A — No Demilitarization Required
Hazard	No hazard code in the DLA record (HMIC N)
Criticality Code	X

⇄ Related Items 4

Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.

4820-01-199-80272640-650 ASSEMBLY A PIECE 2 POSSIBLE MATCH

TAILPIECE,VALVE

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

4730-01-199-81762640-650 PIECE 5 POSSIBLE MATCH

PACKING NUT

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

4820-01-211-51042640-650 ASSEMBLY A POSSIBLE MATCH

VALVE,BALL

Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat

5998-01-313-67152640650 POSSIBLE MATCH

ELECTRONIC COMPONENTS ASSEMBLY

Possible match (shared part number)Alliant Techsystems Operations Llc Div Defense Electronic Systems

Cross-Reference Index

No manufacturer part numbers on file in the U.S. Government catalog.

Reference documents

Reference	Meaning
2640-650 ASSEMBLY D PIECE 3	3/2 Design control — primary reference U.S. Government activity
2640-650	D/9 Drawing number reference only U.S. Government activity
SS-845-2109894	D/9 Drawing number reference only U.S. Government activity
SS-845-2109894 ASSY D PC 3	5/2 Secondary reference U.S. Government activity

Related Parts

4820-01-199-8027POSSIBLE MATCH

TAILPIECE,VALVE

2640-650 ASSEMBLY A PIECE 2

4730-01-199-8176POSSIBLE MATCH

PACKING NUT

2640-650 PIECE 5

4820-01-211-5104POSSIBLE MATCH

VALVE,BALL

2640-650 ASSEMBLY A

5998-01-313-6715POSSIBLE MATCH

ELECTRONIC COMPONENTS ASSEMBLY

2640650

Frequently Asked Questions

What is NSN 4820-01-184-4490?

NSN 4820-01-184-4490 is a Tailpiece,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-184-4490?

4 possible matches (shared part number, not a government interchangeability claim): 4820-01-199-8027, 4730-01-199-8176, 4820-01-211-5104. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-01-184-4490?

Key specifications for 4820-01-184-4490: Design Type: ANGLE; Valve Model Number for Which Designed: 2640-650 ASSY D; Connection Type: FLANGE, ROUND W/HOLES; Valve Size for Which Designed: 5.000 INCHES IN. 6 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-184-4490 hazardous material?

No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.

Sources

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.

U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.

✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.

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