Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN
Flange Diameter: 0.770 INCHES NOMINAL IN
Thread Length: 0.156 INCHES NOMINAL SINGLE THREADED PORTION IN
Style Designator: FAUCET
Body Inside Diameter: 0.300 INCHES NOMINAL IN
Nominal Thread Size: 0.688 INCHES SINGLE THREADED PORTION IN
Under Flange Height: 0.188 INCHES NOMINAL IN
Identification
NSN: 4820-00-409-8855
NIIN: 004098855
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
General Description
The Seat,valve, cataloged under National Stock Number 4820-00-409-8855, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 12 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government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
4820-00-409-8855
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Flange Seat to Disk End Height
0.188 INCHES NOMINAL IN
Flange Diameter
0.770 INCHES NOMINAL IN
Thread Length
0.156 INCHES NOMINAL SINGLE THREADED PORTION IN
Style Designator
FAUCET
Body Inside Diameter
0.300 INCHES NOMINAL IN
Nominal Thread Size
0.688 INCHES SINGLE THREADED PORTION IN
Under Flange Height
0.188 INCHES NOMINAL IN
Thread Class
2A SINGLE THREADED PORTION A
Thread Quantity Per Inch
20 SINGLE THREADED PORTION
Material
ALUMINUM ALLOY OVERALL
Thread Series Designator
UN SINGLE THREADED PORTION
Seating Surface Shape
FLAT
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 Items7
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
5935-00-557-9330POSSIBLE MATCH
CONNECTOR,RECEPTACLE,ELECTRICAL
Possible match (shared part number)
5340-00-827-73888-1-1-3POSSIBLE MATCH
CLEVIS,ROD END
Possible match (shared part number)Celtech Corporation Div Use CAGE 65552 for All Orders
5960-00-990-3124POSSIBLE MATCH
ELECTRON TUBE
Possible match (shared part number)
5999-01-023-92948113POSSIBLE MATCH
CONTACT,ELECTRICAL
Possible match (shared part number)Winchester Interconnect Corporation Dba Winchester Interconnect Div Winchester Interconnect
5325-01-077-38328113POSSIBLE MATCH
RING,RETAINING
Possible match (shared part number)Vacco Industries
5330-01-182-12908-113POSSIBLE MATCH
RING,WIPER
Possible match (shared part number)Aero Space Controls Corp
5330-01-229-8941POSSIBLE MATCH
SEAL,PLAIN
Possible match (shared part number)
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
8113
3/9Design control — primary reference
U.S. Government activity
Related Parts
5935-00-557-9330POSSIBLE MATCH
CONNECTOR,RECEPTACLE,ELECTRICAL
5340-00-827-7388POSSIBLE MATCH
CLEVIS,ROD END
8-1-1-3
5960-00-990-3124POSSIBLE MATCH
ELECTRON TUBE
5999-01-023-9294POSSIBLE MATCH
CONTACT,ELECTRICAL
8113
5325-01-077-3832POSSIBLE MATCH
RING,RETAINING
8113
5330-01-182-1290POSSIBLE MATCH
RING,WIPER
8-113
5330-01-229-8941POSSIBLE MATCH
SEAL,PLAIN
Frequently Asked Questions
What is NSN 4820-00-409-8855?
NSN 4820-00-409-8855 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-00-409-8855?
7 possible matches (shared part number, not a government interchangeability claim): 5935-00-557-9330, 5340-00-827-7388, 5960-00-990-3124. Verify interchangeability with system specifications before substitution.
What are the specifications of 4820-00-409-8855?
Key specifications for 4820-00-409-8855: Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN; Flange Diameter: 0.770 INCHES NOMINAL IN; Thread Length: 0.156 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: FAUCET. 12 specifications are documented in the U.S. Government catalog.
Is NSN 4820-00-409-8855 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.