The Diaphragm,actuator Valve,special, cataloged under National Stock Number 4820-00-405-1803, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 9 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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
4820-00-405-1803
Item Name
Diaphragm,actuator Valve,special
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Outside Diameter
11.500 INCHES NOMINAL IN
Taper Minor Diameter
8.250 INCHES NOMINAL IN
Style Designator
SPECIAL SHAPED
Taper Major Diameter
10.625 INCHES NOMINAL IN
Material Thickness
0.072 INCHES NOMINAL IN
Bolt Hole Quantity
12
Bolt Circle Diameter
10.825 INCHES NOMINAL IN
Material
RUBBER
Hole Diameter
0.350 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 Items4
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
2915-00-452-8340POSSIBLE MATCH
RETAINER SPECIAL
Possible match (shared part number)
5330-00-494-194175514-376-18POSSIBLE MATCH
PACKING SET
Possible match (shared part number)William Powell Company, the Dba Powell Valve Div the Starflo Corporation
5120-00-816-5707HIT1420POSSIBLE MATCH
INSERTER,SCREW THREAD INSERT
Possible match (shared part number)Helical Wire Inc
5365-00-900-102775514POSSIBLE MATCH
RING,EXTERNALLY THREADED
Possible match (shared part number)Parker-Hannifin Corporation
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
75514
3/9Design control — primary reference
U.S. Government activity
Related Parts
2915-00-452-8340POSSIBLE MATCH
RETAINER SPECIAL
5330-00-494-1941POSSIBLE MATCH
PACKING SET
75514-376-18
5120-00-816-5707POSSIBLE MATCH
INSERTER,SCREW THREAD INSERT
HIT1420
5365-00-900-1027POSSIBLE MATCH
RING,EXTERNALLY THREADED
75514
Frequently Asked Questions
What is NSN 4820-00-405-1803?
NSN 4820-00-405-1803 is a Diaphragm,actuator Valve,special, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-00-405-1803?
4 possible matches (shared part number, not a government interchangeability claim): 2915-00-452-8340, 5330-00-494-1941, 5120-00-816-5707. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-00-405-1803?
Key specifications for 4820-00-405-1803: Overall Height: 1.250 INCHES NOMINAL IN; Outside Diameter: 11.500 INCHES NOMINAL IN; Taper Minor Diameter: 8.250 INCHES NOMINAL IN; Style Designator: SPECIAL SHAPED. 9 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-405-1803 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.