Seat, Valve4820-01-057-6898

NSN 4820-01-057-6898 · NIIN 010576898

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-057-6898 · 4820010576898 · NIIN 010576898 · 01-057-6898 · FSC 4820 Valves, Nonpowered · 2640-929X1PC9 · SS845-2444643CP · SS845-2444643CPC9

Nearby stock numbers ← 4820-01-057-6897 Seat, Valve · 4820-01-057-6926 Cartridge, Valve →

4820-01-057-6898 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Body Outside Diameter: 4.875 INCHES NOMINAL IN
Style Designator: PLAIN
Material Document and Classification: QQ-N-288,COMP E FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Body Inside Diameter: 4.500 INCHES MINIMUM AND 4.502 INCHES MAXIMUM IN
Material: NICKEL ALLOY OVERALL
Seating Surface Shape: FLAT

Identification

NSN: 4820-01-057-6898
NIIN: 010576898
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-057-6898, 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6 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.

Technical Specifications

Parameter	Value
NSN	4820-01-057-6898
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Body Outside Diameter	4.875 INCHES NOMINAL IN
Style Designator	PLAIN
Material Document and Classification	QQ-N-288,COMP E FED SPEC SINGLE MATERIAL RESPONSE OVERALL
Body Inside Diameter	4.500 INCHES MINIMUM AND 4.502 INCHES MAXIMUM IN
Material	NICKEL ALLOY OVERALL
Seating Surface Shape	FLAT

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

Cross-Reference Index

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

Reference documents

Reference	Meaning
2640-929X1PC9	3/2 Design control — primary reference U.S. Government activity
SS845-2444643CP	C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command
SS845-2444643CPC9	5/9 Secondary reference Naval Sea Systems Command

No interchangeability data on file.

Other items in FSC 4820 — Valves, Nonpowered

Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.

4820-00-000-0097

4820-00-000-0097 · Item name not on file

4820-00-001-0010

VALVE,ROTARY,SELECTOR

4820-00-001-0020

4820-00-001-0020 · Item name not on file

4820-00-001-0021

4820-00-001-0021 · Item name not on file

4820-00-001-0032

4820-00-001-0032 · Item name not on file

4820-00-001-0037

VALVE,SAFETY RELIEF

4820-00-001-0042

4820-00-001-0042 · Item name not on file

4820-00-001-1230

4820-00-001-1230 · Item name not on file

Frequently Asked Questions

What is NSN 4820-01-057-6898?

NSN 4820-01-057-6898 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What are the specifications of 4820-01-057-6898?

Key specifications for 4820-01-057-6898: Overall Height: 0.547 INCHES NOMINAL IN; Body Outside Diameter: 4.875 INCHES NOMINAL IN; Style Designator: PLAIN; Material Document and Classification: QQ-N-288,COMP E FED SPEC SINGLE MATERIAL RESPONSE OVERALL. 6 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-057-6898 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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