The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-678-0291, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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
4820-00-678-0291
Item Name
Diaphragm,valve,flat
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Outside Diameter
3.375 INCHES NOMINAL IN
Style Designator
FLAT
Material Thickness
0.016 INCHES NOMINAL IN
Bolt Hole Quantity
12
Bolt Circle Diameter
2.812 INCHES NOMINAL IN
Material
RUBBER FABRIC REINFORCED
Hole Diameter
0.280 INCHES NOMINAL IN
Reference Number Differentiating Characteristics
CLEANING, PACKAGING, AND MARKING IAW THE LATEST REVISION OF MIL-STD-1330
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 Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4710-00-720-117014474POSSIBLE MATCH
TUBE ASSEMBLY,METAL
Possible match (shared part number)Triumph Controls, Llc Dba Triumph Controls, Llc
5360-00-919-967414474POSSIBLE MATCH
SPRING,SPIRAL,TORSION
Possible match (shared part number)Drs C3 & Aviation Company Dba Drs Data & Imaging Systems
5915-01-136-2632F90008POSSIBLE MATCH
FILTER,BAND SUPPRESSION
Possible match (shared part number)Ryt Industries Inc
3040-01-229-7588H14474POSSIBLE MATCH
SHAFT,SHOULDERED
Possible match (shared part number)Meggitt Defense Systems, Inc. Dba Meggitt Defense Systems Inc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
1447-4
3/1Design control — primary reference
U.S. Government activity
Related Parts
4710-00-720-1170POSSIBLE MATCH
TUBE ASSEMBLY,METAL
14474
5360-00-919-9674POSSIBLE MATCH
SPRING,SPIRAL,TORSION
14474
5915-01-136-2632POSSIBLE MATCH
FILTER,BAND SUPPRESSION
F90008
3040-01-229-7588POSSIBLE MATCH
SHAFT,SHOULDERED
H14474
Frequently Asked Questions
What is NSN 4820-00-678-0291?
NSN 4820-00-678-0291 is a Diaphragm,valve,flat, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-00-678-0291?
4 possible matches (shared part number, not a government interchangeability claim): 4710-00-720-1170, 5360-00-919-9674, 5915-01-136-2632. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-00-678-0291?
Key specifications for 4820-00-678-0291: Outside Diameter: 3.375 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.016 INCHES NOMINAL IN; Bolt Hole Quantity: 12. 8 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-678-0291 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.