Diaphragm, Valve, Flat4820-00-678-0268

NSN 4820-00-678-0268 · NIIN 006780268

FSC 4820 — Valves, Nonpowered · FSG 48 — Valves

Government record, cited

Also searched as 4820-00-678-0268 · 4820006780268 · NIIN 006780268 · 00-678-0268 · FSC 4820 Valves, Nonpowered · 1870-37 · 81393-01 · 1870-37

Nearby stock numbers ← 4820-00-678-0264 Seat, Valve · 4820-00-678-0269 →

4820-00-678-0268 — Valves, Nonpowered

Features

Diaphragm,valve,flat — FSC 4820
Outside Diameter: 3.250 INCHES NOMINAL IN
Style Designator: FLAT
Material Thickness: 0.007 INCHES NOMINAL IN
Center Hole Diameter: 0.188 INCHES NOMINAL IN
Material: RUBBER FABRIC REINFORCED

Identification

NSN: 4820-00-678-0268
NIIN: 006780268
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves

General Description

The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-678-0268, 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5 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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	4820-00-678-0268
Item Name	Diaphragm,valve,flat
FSC / FSG	4820 / 48 — Valves, Nonpowered
Status	ACTIVE
Outside Diameter	3.250 INCHES NOMINAL IN
Style Designator	FLAT
Material Thickness	0.007 INCHES NOMINAL IN
Center Hole Diameter	0.188 INCHES NOMINAL IN
Material	RUBBER FABRIC REINFORCED

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 2

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

5961-01-433-1629HCT1279 POSSIBLE MATCH

SEMICONDUCTOR DEVICES,UNITIZED

Possible match (shared part number)Optek Technology, Inc

5340-01-492-2681187037 POSSIBLE MATCH

PLUG,PROTECTIVE,DUST AND MOISTUR

Possible match (shared part number)L3harris Technologies, Inc Div Space & Airborne Systems

Cross-Reference Index

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

Reference documents

Reference	Meaning
1870-37	5/9 Secondary reference General Regulator Corp. Dba Accudriv
81393-01	3/9 Design control — primary reference General Regulator Corp. Dba Accudriv
1870-37	5/9 Secondary reference General Machine Works, Inc.

Related Parts

5961-01-433-1629POSSIBLE MATCH

SEMICONDUCTOR DEVICES,UNITIZED

HCT1279

5340-01-492-2681POSSIBLE MATCH

PLUG,PROTECTIVE,DUST AND MOISTUR

187037

Frequently Asked Questions

What is NSN 4820-00-678-0268?

NSN 4820-00-678-0268 is a Diaphragm,valve,flat, classified under FSC 4820, Valves, Nonpowered. Status: active.

What NSN replaces 4820-00-678-0268?

2 possible matches (shared part number, not a government interchangeability claim): 5961-01-433-1629, 5340-01-492-2681. Verify interchangeability with system specifications before substitution.

What are the specifications of 4820-00-678-0268?

Key specifications for 4820-00-678-0268: Outside Diameter: 3.250 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.007 INCHES NOMINAL IN; Center Hole Diameter: 0.188 INCHES NOMINAL IN. 5 specifications are documented in the U.S. Government catalog.

Is NSN 4820-00-678-0268 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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