PartsTable TECHNICAL DATA SHEET

NSN 4820-01-084-7181Government record, cited

Base Assembly, Valve4820-01-084-7181

NSN 4820-01-084-7181 · NIIN 010847181

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-01-084-7181 · 4820010847181 · NIIN 010847181 · 01-084-7181 · FSC 4820 Valves, Nonpowered · 845-4687729 ITEM 7 · 845-4687729 · 2641-792-04 ITEM 7 · 4687729-0007

Nearby stock numbers ← 4820-01-084-7155 · 4820-01-084-7185 Disk, Rupturable →

4820-01-084-7181 — Valves, Nonpowered

Features

Base Assembly,valve — FSC 4820
General Characteristics Item Description: STEEL; CONSIST OF ONE ROUND PLATE 3.250 IN. DIA,6.250 LG; ONE RECTANGLE 3.750 IN. W,7.000 IN. LG IN

Identification

NSN: 4820-01-084-7181
NIIN: 010847181
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Base Assembly,valve, cataloged under National Stock Number 4820-01-084-7181, 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1 specification, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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	4820-01-084-7181
Item Name	Base Assembly,valve
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
General Characteristics Item Description	STEEL; CONSIST OF ONE ROUND PLATE 3.250 IN. DIA,6.250 LG; ONE RECTANGLE 3.750 IN. W,7.000 IN. LG 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 6

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

4820-01-085-18372641-792-04 ITEM 1 POSSIBLE MATCH

GEAR BOX,VALVE

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

4820-01-085-18382641-792-04 ITEM 2 POSSIBLE MATCH

BODY,GEAR BOX,VALVE

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

3020-01-085-18882641-792-04 ITEM 5 POSSIBLE MATCH

GEAR,SPUR

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

5355-01-086-4130845-4687729 ITEM 11 POSSIBLE MATCH

POINTER,VALVE

Possible match (shared part number)Naval Ship Systems Command

4820-01-123-16522641-792-04 ITEM 27 POSSIBLE MATCH

GEAR BOX

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

3020-01-170-25632641-792-04 ITEM 6 POSSIBLE MATCH

GEAR,SPUR

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

Cross-Reference Index

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

Reference documents

Reference	Meaning
845-4687729 ITEM 7	5/2 Secondary reference U.S. Government activity
845-4687729	D/9 Drawing number reference only U.S. Government activity
2641-792-04 ITEM 7	3/2 Design control — primary reference U.S. Government activity
4687729-0007	3/2 Design control — primary reference U.S. Government activity

Related Parts

4820-01-085-1837POSSIBLE MATCH

GEAR BOX,VALVE

2641-792-04 ITEM 1

4820-01-085-1838POSSIBLE MATCH

BODY,GEAR BOX,VALVE

2641-792-04 ITEM 2

3020-01-085-1888POSSIBLE MATCH

GEAR,SPUR

2641-792-04 ITEM 5

5355-01-086-4130POSSIBLE MATCH

POINTER,VALVE

845-4687729 ITEM 11

4820-01-123-1652POSSIBLE MATCH

GEAR BOX

2641-792-04 ITEM 27

3020-01-170-2563POSSIBLE MATCH

GEAR,SPUR

2641-792-04 ITEM 6

Frequently Asked Questions

What is NSN 4820-01-084-7181?

NSN 4820-01-084-7181 is a Base Assembly,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-01-084-7181?

6 possible matches (shared part number, not a government interchangeability claim): 4820-01-085-1837, 4820-01-085-1838, 3020-01-085-1888. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-01-084-7181?

Key specifications for 4820-01-084-7181: General Characteristics Item Description: STEEL; CONSIST OF ONE ROUND PLATE 3.250 IN. DIA,6.250 LG; ONE RECTANGLE 3.750 IN. W,7.000 IN. LG IN. 1 specification is documented in the U.S. Government catalog.

Is NSN 4820-01-084-7181 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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