PartsTable TECHNICAL DATA SHEET

NSN 4820-01-063-1895Government record, cited

Seat, Valve4820-01-063-1895

NSN 4820-01-063-1895 · NIIN 010631895

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-063-1895 · 4820010631895 · NIIN 010631895 · 01-063-1895 · FSC 4820 Valves, Nonpowered · 803-2178493 PIECE 30 · 2640-820X8PC3 · 803-2178493-A-3 · 810-2178493PIECE3 · 810-2178493

Nearby stock numbers ← 4820-01-063-1888 · 4820-01-063-1934 Stem, Fluid Valve →

4820-01-063-1895 — Valves, Nonpowered

Features

Seat,valve — FSC 4820
Body Outside Diameter: 3.873 INCHES NOMINAL IN
Style Designator: PLAIN
Body Inside Diameter: 3.430 INCHES NOMINAL IN
Material: NICKEL ALLOY OVERALL
Seating Surface Shape: FLAT

Identification

NSN: 4820-01-063-1895
NIIN: 010631895
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Seat,valve, cataloged under National Stock Number 4820-01-063-1895, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 5 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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	4820-01-063-1895
Item Name	Seat,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Body Outside Diameter	3.873 INCHES NOMINAL IN
Style Designator	PLAIN
Body Inside Diameter	3.430 INCHES NOMINAL 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

⇄ Related Items 6

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

4820-01-063-1934810-2178493 PIECE 6 POSSIBLE MATCH

STEM,FLUID VALVE

Possible match (shared part number)Naval Sea Systems Command

4820-01-087-00022640-649 4IN PC10 POSSIBLE MATCH

PLUG,ROTARY,VALVE

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

4820-01-094-1930810-2178493 PIECE 9 POSSIBLE MATCH

STOP POSITION INDICATOR

Possible match (shared part number)Naval Ship Systems Command

5340-01-108-0277810-2178493-A-23 POSSIBLE MATCH

HANDWHEEL

Possible match (shared part number)Naval Ship Systems Command

4820-01-111-4603810-2178493 ASSYA/DS SWCH IND POSSIBLE MATCH

VALVE,BALL

Possible match (shared part number)Naval Ship Systems Command

4820-01-407-7539803-2178493 PIECE 1,2 POSSIBLE MATCH

PARTS KIT,BALL VALVE

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
803-2178493 PIECE 30	3/2 Design control — primary reference U.S. Government activity
2640-820X8PC3	5/2 Secondary reference U.S. Government activity
803-2178493-A-3	C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity
810-2178493PIECE3	5/9 Secondary reference Naval Sea Systems Command
810-2178493	D/9 Drawing number reference only Naval Sea Systems Command

Related Parts

4820-01-063-1934POSSIBLE MATCH

STEM,FLUID VALVE

810-2178493 PIECE 6

4820-01-087-0002POSSIBLE MATCH

PLUG,ROTARY,VALVE

2640-649 4IN PC10

4820-01-094-1930POSSIBLE MATCH

STOP POSITION INDICATOR

810-2178493 PIECE 9

5340-01-108-0277POSSIBLE MATCH

HANDWHEEL

810-2178493-A-23

4820-01-111-4603POSSIBLE MATCH

VALVE,BALL

810-2178493 ASSYA/DS SWCH IND

4820-01-407-7539POSSIBLE MATCH

PARTS KIT,BALL VALVE

803-2178493 PIECE 1,2

Frequently Asked Questions

What is NSN 4820-01-063-1895?

NSN 4820-01-063-1895 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-063-1895?

6 possible matches (shared part number, not a government interchangeability claim): 4820-01-063-1934, 4820-01-087-0002, 4820-01-094-1930. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-01-063-1895?

Key specifications for 4820-01-063-1895: Overall Height: 0.358 INCHES NOMINAL IN; Body Outside Diameter: 3.873 INCHES NOMINAL IN; Style Designator: PLAIN; Body Inside Diameter: 3.430 INCHES NOMINAL IN. 5 specifications are documented in the U.S. Government catalog.

Is NSN 4820-01-063-1895 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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