Cover, Half4820-01-209-4583

NSN 4820-01-209-4583 · NIIN 012094583

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-209-4583 · 4820012094583 · NIIN 012094583 · 01-209-4583 · FSC 4820 Valves, Nonpowered · SSN671-515-2047288 PIECE 22 · 515-2047288 · 71553-78X7 · 71553-78X7 PIECE 22

Nearby stock numbers ← 4820-01-209-4582 Pad, Disk, Globe Valve · 4820-01-209-4584 Retainer, Valve Pad →

4820-01-209-4583 — Valves, Nonpowered

Features

Cover,half — FSC 4820
General Characteristics Item Description: SEMI-CIRCLE SHAPE; 6 HOLES 0.656 IN. DIA; 12 HOLES 0.531 IN. DIA; 3 HOLES 0.406 IN. DIA; 3.000 IN. THK IN

Identification

NSN: 4820-01-209-4583
NIIN: 012094583
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Cover,half, cataloged under National Stock Number 4820-01-209-4583, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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	4820-01-209-4583
Item Name	Cover,half
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
General Characteristics Item Description	SEMI-CIRCLE SHAPE; 6 HOLES 0.656 IN. DIA; 12 HOLES 0.531 IN. DIA; 3 HOLES 0.406 IN. DIA; 3.000 IN. THK IN

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.

4820-01-209-458471553-78X7 PIECE 3 POSSIBLE MATCH

RETAINER,VALVE PAD

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

5342-01-220-9270SSN671-515-2047288 PIECE 20 POSSIBLE MATCH

DASHPOT

Possible match (shared part number)Naval Ship Systems Command

Cross-Reference Index

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

Reference documents

Reference	Meaning
SSN671-515-2047288 PIECE 22	5/2 Secondary reference U.S. Government activity
515-2047288	D/9 Drawing number reference only U.S. Government activity
71553-78X7	D/9 Drawing number reference only U.S. Government activity
71553-78X7 PIECE 22	3/2 Design control — primary reference U.S. Government activity

Related Parts

4820-01-209-4584POSSIBLE MATCH

RETAINER,VALVE PAD

71553-78X7 PIECE 3

5342-01-220-9270POSSIBLE MATCH

DASHPOT

SSN671-515-2047288 PIECE 20

Frequently Asked Questions

What is NSN 4820-01-209-4583?

NSN 4820-01-209-4583 is a Cover,half, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-209-4583?

2 possible matches (shared part number, not a government interchangeability claim): 4820-01-209-4584, 5342-01-220-9270. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-01-209-4583?

Key specifications for 4820-01-209-4583: General Characteristics Item Description: SEMI-CIRCLE SHAPE; 6 HOLES 0.656 IN. DIA; 12 HOLES 0.531 IN. DIA; 3 HOLES 0.406 IN. DIA; 3.000 IN. THK IN. 1 specification is documented in the U.S. Government catalog.

Is NSN 4820-01-209-4583 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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