PartsTable TECHNICAL DATA SHEET

NSN 4820-01-571-3521Government record, cited

Valve, Vent4820-01-571-3521

NSN 4820-01-571-3521 · NIIN 015713521 · Part number F646ACDGM

Meggitt North Hollywood Inc · FSC 4820 — Valves, Nonpowered · FSG 48 — Valves · CAGE 79318

Government record, cited

NSN 4820-01-571-3521 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-571-3521. Manufacturer of record part number: F646ACDGM.

Also searched as 4820-01-571-3521 · 4820015713521 · NIIN 015713521 · 01-571-3521 · FSC 4820 Valves, Nonpowered · CAGE 79318 · F646ACDGM · F646ACDG · 3591247 · 3591247

Nearby stock numbers ← 4820-01-571-3510 Parts Kit, Ball Valve · 4820-01-571-3550 Ball, Valve, Ported →

4820-01-571-3521 — Valves, Nonpowered

Features

Valve,vent — FSC 4820
2 manufacturer part numbers on file
Manufacturer of record: Meggitt North Hollywood Inc

Identification

NSN: 4820-01-571-3521
NIIN: 015713521
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: F646ACDGM
Manufacturer: Meggitt North Hollywood Inc

General Description

The Valve,vent, cataloged under National Stock Number 4820-01-571-3521, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Meggitt North Hollywood Inc. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.

Catalog Facts

Item Name	Valve,vent
FSC / FSG	4820 — Valves, Nonpowered (FSG 48)
Manufacturers	Oshkosh Defense Llc (CAGE 75Q65); Meggitt North Hollywood Inc (CAGE 79318)

Technical Specifications

Parameter	Value
NSN	4820-01-571-3521
Primary Part Number	F646ACDGM
Item Name	Valve,vent
FSC / FSG	4820 / 48 — Valves, Nonpowered
Manufacturer	Meggitt North Hollywood Inc
Status	ACTIVE

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

Part Number	Manufacturer
3591247	Oshkosh Defense Llc (USA)
F646ACDGM PRIMARY	Meggitt North Hollywood Inc (USA)

Reference documents

Reference	Meaning
F646ACDG	5/9 Secondary reference Meggitt North Hollywood Inc
3591247	7/9 Vendor item drawing reference Oshkosh Corp

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 4820-01-571-3521?

NSN 4820-01-571-3521 is a Valve,vent, manufactured by Meggitt North Hollywood Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.

What part numbers are listed for NSN 4820-01-571-3521?

NSN 4820-01-571-3521 has 2 manufacturer part numbers on file: 3591247 (Oshkosh Defense Llc), F646ACDGM (Meggitt North Hollywood Inc).

Is NSN 4820-01-571-3521 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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