PartsTable TECHNICAL DATA SHEET

NSN 4820-01-665-4866Government record, cited

Piston, Valve4820-01-665-4866

NSN 4820-01-665-4866 · NIIN 016654866

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-665-4866 · 4820016654866 · NIIN 016654866 · 01-665-4866 · FSC 4820 Valves, Nonpowered · 12052304 ITEM 1 · 12052025-1 · 12052304

Nearby stock numbers ← 4820-01-665-4750 Ball, Check · 4820-01-665-4903 Valve Assembly, Over →

4820-01-665-4866 — Valves, Nonpowered

Features

Piston,valve — FSC 4820

Identification

NSN: 4820-01-665-4866
NIIN: 016654866
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Piston,valve, cataloged under National Stock Number 4820-01-665-4866, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.

Catalog Facts

Item Name	Piston,valve
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)

Technical Specifications

Parameter	Value
NSN	4820-01-665-4866
Item Name	Piston,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE

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 5

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

4820-01-665-501112052024-1 POSSIBLE MATCH

PISTON,VALVE

Possible match (shared part number)Vacco Industries

3040-01-665-574512052506-01 POSSIBLE MATCH

RING,PISTON

Possible match (shared part number)Vacco Industries

5330-01-665-582212052065-1 POSSIBLE MATCH

SEAL,NONMETALLIC ROUND SECTION

Possible match (shared part number)Vacco Industries

5330-01-665-582412052064-1 POSSIBLE MATCH

SEAL,NONMETALLIC ROUND SECTION

Possible match (shared part number)Vacco Industries

5360-01-665-583612052026-1 POSSIBLE MATCH

SPRING,HELICAL,COMPRESSION

Possible match (shared part number)Vacco Industries

Cross-Reference Index

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

Reference documents

Reference	Meaning
12052304 ITEM 1	C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity
12052025-1	3/2 Design control — primary reference U.S. Government activity
12052304	D/9 Drawing number reference only U.S. Government activity

Related Parts

4820-01-665-5011POSSIBLE MATCH

PISTON,VALVE

12052024-1

3040-01-665-5745POSSIBLE MATCH

RING,PISTON

12052506-01

5330-01-665-5822POSSIBLE MATCH

SEAL,NONMETALLIC ROUND SECTION

12052065-1

5330-01-665-5824POSSIBLE MATCH

SEAL,NONMETALLIC ROUND SECTION

12052064-1

5360-01-665-5836POSSIBLE MATCH

SPRING,HELICAL,COMPRESSION

12052026-1

Frequently Asked Questions

What is NSN 4820-01-665-4866?

NSN 4820-01-665-4866 is a Piston,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-665-4866?

5 possible matches (shared part number, not a government interchangeability claim): 4820-01-665-5011, 3040-01-665-5745, 5330-01-665-5822. Verify interchangeability with system specifications before substitution.

Is NSN 4820-01-665-4866 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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