Retainer, Disk, Valve4820-01-066-9551

NSN 4820-01-066-9551 · NIIN 010669551

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-066-9551 · 4820010669551 · NIIN 010669551 · 01-066-9551 · FSC 4820 Valves, Nonpowered · DD3545 · DD3545-19

Nearby stock numbers ← 4820-01-066-9550 Guide, Valve · 4820-01-066-9553 Element, Thermostat, Valve →

4820-01-066-9551 — Valves, Nonpowered

Features

Retainer,disk,valve — FSC 4820
Outside Diameter: 4.812 INCHES NOMINAL IN
Material Document and Classification: QQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE
Inside Diameter: 4.812 INCHES NOMINAL IN
Material: NICKEL ALLOY

Identification

NSN: 4820-01-066-9551
NIIN: 010669551
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Retainer,disk,valve, cataloged under National Stock Number 4820-01-066-9551, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 4 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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	4820-01-066-9551
Item Name	Retainer,disk,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Outside Diameter	4.812 INCHES NOMINAL IN
Material Document and Classification	QQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE
Inside Diameter	4.812 INCHES NOMINAL 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 2

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

4820-01-067-5022DD3545-11 POSSIBLE MATCH

SEAT,VALVE

Possible match (shared part number)Clow Corp Marine Valve Products Div

4820-01-072-8358DD3545-5 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Clow Corp Marine Valve Products Div

Cross-Reference Index

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

Reference documents

Reference	Meaning
DD3545	3/2 Design control — primary reference U.S. Government activity
DD3545-19	3/2 Design control — primary reference U.S. Government activity

Related Parts

4820-01-067-5022POSSIBLE MATCH

SEAT,VALVE

DD3545-11

4820-01-072-8358POSSIBLE MATCH

STEM,FLUID VALVE

DD3545-5

Frequently Asked Questions

What is NSN 4820-01-066-9551?

NSN 4820-01-066-9551 is a Retainer,disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-066-9551?

2 possible matches (shared part number, not a government interchangeability claim): 4820-01-067-5022, 4820-01-072-8358. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-01-066-9551?

Key specifications for 4820-01-066-9551: Outside Diameter: 4.812 INCHES NOMINAL IN; Material Document and Classification: QQ-N-288 FED SPEC SINGLE MATERIAL RESPONSE; Inside Diameter: 4.812 INCHES NOMINAL IN; Special Features: FLANGE STYLE; 0.125 IN. FLANGE THICKNESS IN. 4 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-066-9551 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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