PartsTable TECHNICAL DATA SHEET

NSN 4820-01-350-1522Government record, cited

Seat, Valve4820-01-350-1522

NSN 4820-01-350-1522 · NIIN 013501522 · Part number 556-6408589-8

Naval Sea Systems Command · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 53711

Government record, cited

NSN 4820-01-350-1522 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-350-1522. Manufacturer of record part number: 556-6408589-8.

Also searched as 4820-01-350-1522 · 4820013501522 · NIIN 013501522 · 01-350-1522 · FSC 4820 Valves, Nonpowered · CAGE 53711 · 556-6408589-8 · DF330661 FIND 8 · 556-6408589 · 211054812

Nearby stock numbers ← 4820-01-350-1518 Body, Valve · 4820-01-350-1523 Seat, Valve →

4820-01-350-1522 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Material: PLASTIC POLYAMIDE NYLON SEAT
2 manufacturer part numbers on file
Manufacturer of record: Naval Sea Systems Command

Identification

NSN: 4820-01-350-1522
NIIN: 013501522
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 556-6408589-8
Manufacturer: Naval Sea Systems Command

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-350-1522, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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	4820-01-350-1522
Primary Part Number	556-6408589-8
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Naval Sea Systems Command
Status	ACTIVE
Material	PLASTIC POLYAMIDE NYLON SEAT

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 8

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

4820-01-350-1644556-6408589-8,28 POSSIBLE MATCH

PARTS KIT,BALL VALVE

Possible match (shared part number)Naval Sea Systems Command

4820-01-350-1705556-6408589-18 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Naval Sea Systems Command

4810-01-492-982214509362 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Naval Sea Systems Command

4820-01-500-656814509361 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Naval Sea Systems Command

4820-01-500-688314509379 POSSIBLE MATCH

VALVE,BALL

Possible match (shared part number)Naval Sea Systems Command

4820-01-645-2248556-6408589-8-ERDF330661D1 POSSIBLE MATCH

SEAT,VALVE

Possible match (shared part number)Naval Sea Systems Command

4820-01-645-2252556-6408589-7-ERDF330661D1 POSSIBLE MATCH

SEAT,VALVE

Possible match (shared part number)Naval Sea Systems Command

5360-01-645-5356556-6408589-38-ERDF330661D2 POSSIBLE MATCH

SPRING,FLAT

Possible match (shared part number)Naval Sea Systems Command

Cross-Reference Index

Part Number	Manufacturer
211054812	Naval Sea Systems Command (USA)
556-6408589-8 PRIMARY	Naval Sea Systems Command (USA)

Reference documents

Reference	Meaning
DF330661 FIND 8	C/1 Advisory reference — outside the item-of-supply concept Huntington Ingalls Inc Div Newport News Shipbuilding
556-6408589	D/9 Drawing number reference only Naval Sea Systems Command

Related Parts

4820-01-350-1644POSSIBLE MATCH

PARTS KIT,BALL VALVE

556-6408589-8,28

4820-01-350-1705POSSIBLE MATCH

STEM,FLUID VALVE

556-6408589-18

4810-01-492-9822POSSIBLE MATCH

STEM,FLUID VALVE

14509362

4820-01-500-6568POSSIBLE MATCH

STEM,FLUID VALVE

14509361

4820-01-500-6883POSSIBLE MATCH

VALVE,BALL

14509379

4820-01-645-2248POSSIBLE MATCH

SEAT,VALVE

556-6408589-8-ERDF330661D1

4820-01-645-2252POSSIBLE MATCH

SEAT,VALVE

556-6408589-7-ERDF330661D1

5360-01-645-5356POSSIBLE MATCH

SPRING,FLAT

556-6408589-38-ERDF330661D2

Frequently Asked Questions

What is NSN 4820-01-350-1522?

NSN 4820-01-350-1522 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-350-1522?

NSN 4820-01-350-1522 has 2 manufacturer part numbers on file: 211054812 (Naval Sea Systems Command), 556-6408589-8 (Naval Sea Systems Command).

What NSN replaces 4820-01-350-1522?

8 possible matches (shared part number, not a government interchangeability claim): 4820-01-350-1644, 4820-01-350-1705, 4810-01-492-9822. Verify interchangeability with system specifications before substitution.

What are the specifications of 556-6408589-8?

Key specifications for 556-6408589-8: Special Features: 1.061 IN. OD; 0.256 IN. H; FOR 0.250 IN. BALL VALVE IN; Material: PLASTIC POLYAMIDE NYLON SEAT. 1 specification is documented in the U.S. Government catalog.

Is NSN 4820-01-350-1522 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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