The Diaphragm,valve,flat, cataloged under National Stock Number 4820-00-609-9735, 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8 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-00-609-9735
Item Name
Diaphragm,valve,flat
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Outside Diameter
8.000 INCHES NOMINAL IN
Style Designator
FLAT
Material Thickness
0.135 INCHES NOMINAL IN
Bolt Hole Quantity
8
Bolt Circle Diameter
7.062 INCHES NOMINAL IN
Center Hole Diameter
2.500 INCHES NOMINAL IN
Material
RUBBER FABRIC REINFORCED
Hole Diameter
0.535 INCHES NOMINAL 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 Items5
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5950-00-647-853823507POSSIBLE MATCH
TRANSFORMER,POWER
Possible match (shared part number)L3harris Technologies, Inc Div Space & Airborne Systems
2915-00-693-169323507POSSIBLE MATCH
COVER ASSEMBLY,FUEL PUMP
Possible match (shared part number)Triumph Engine Control Systems Llc
3040-01-187-718323507POSSIBLE MATCH
HEAD,LINEAR ACTUATING CYLINDER
Possible match (shared part number)Moog Inc. Dba Ampac-Isp Corp
5340-01-418-713323507POSSIBLE MATCH
CAP,PROTECTIVE,DUST AND MOISTURE
Possible match (shared part number)Parker Hannifin Corporation Div Hydraulic Systems Division
5340-01-586-845023507POSSIBLE MATCH
BOOT,DUST AND MOISTURE SEAL
Possible match (shared part number)Waytek, Inc
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
23507
5/9Secondary reference
Desco Corp Marsh Bellofram Div
DPM18-1
3/2Design control — primary reference
U.S. Government activity
Related Parts
5950-00-647-8538POSSIBLE MATCH
TRANSFORMER,POWER
23507
2915-00-693-1693POSSIBLE MATCH
COVER ASSEMBLY,FUEL PUMP
23507
3040-01-187-7183POSSIBLE MATCH
HEAD,LINEAR ACTUATING CYLINDER
23507
5340-01-418-7133POSSIBLE MATCH
CAP,PROTECTIVE,DUST AND MOISTURE
23507
5340-01-586-8450POSSIBLE MATCH
BOOT,DUST AND MOISTURE SEAL
23507
Frequently Asked Questions
What is NSN 4820-00-609-9735?
NSN 4820-00-609-9735 is a Diaphragm,valve,flat, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-00-609-9735?
5 possible matches (shared part number, not a government interchangeability claim): 5950-00-647-8538, 2915-00-693-1693, 3040-01-187-7183. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-00-609-9735?
Key specifications for 4820-00-609-9735: Outside Diameter: 8.000 INCHES NOMINAL IN; Style Designator: FLAT; Material Thickness: 0.135 INCHES NOMINAL IN; Bolt Hole Quantity: 8. 8 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-609-9735 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.