NSN 4820-01-431-1366 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-431-1366. Manufacturer of record part number: 803-6983468-PC032.
Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN
Flange Diameter: 3.940 INCHES NOMINAL IN
Thread Length: 0.881 INCHES NOMINAL SINGLE THREADED PORTION IN
Style Designator: THREADED FLANGED
Body Inside Diameter: 2.500 INCHES MINIMUM AND 2.502 INCHES MAXIMUM IN
Nominal Thread Size: 3.125 INCHES SINGLE THREADED PORTION IN
Under Flange Height: 0.970 INCHES NOMINAL IN
Identification
NSN: 4820-01-431-1366
NIIN: 014311366
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 803-6983468-PC032
Manufacturer: Naval Sea Systems Command
General Description
The Seat,valve, cataloged under National Stock Number 4820-01-431-1366, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 12 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-431-1366
Primary Part Number
803-6983468-PC032
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
Flange Seat to Disk End Height
0.188 INCHES NOMINAL IN
Flange Diameter
3.940 INCHES NOMINAL IN
Thread Length
0.881 INCHES NOMINAL SINGLE THREADED PORTION IN
Style Designator
THREADED FLANGED
Body Inside Diameter
2.500 INCHES MINIMUM AND 2.502 INCHES MAXIMUM IN
Nominal Thread Size
3.125 INCHES SINGLE THREADED PORTION IN
Under Flange Height
0.970 INCHES NOMINAL IN
Thread Class
2A SINGLE THREADED PORTION A
Thread Quantity Per Inch
8 SINGLE THREADED PORTION
Material
COPPER 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 Items6
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-431-1371803-6983468-PC074POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-431-66696983468-PIECE 53POSSIBLE MATCH
PISTON,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-431-66706983468-PIECE 20POSSIBLE MATCH
DIAPHRAGM,VALVE,FLAT
Possible match (shared part number)Naval Sea Systems Command
4820-01-431-9091803-6983468-PC023POSSIBLE MATCH
DIAPHRAGM,VALVE,FLAT
Possible match (shared part number)Naval Sea Systems Command
4820-01-431-9094803-6983468-PC040POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-431-9193803-6983468-PCO33POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Naval Sea Systems Command
NSN 4820-01-431-1366 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-431-1366?
NSN 4820-01-431-1366 has 1 manufacturer part number on file: 803-6983468-PC032 (Naval Sea Systems Command).
What NSN replaces 4820-01-431-1366?
6 possible matches (shared part number, not a government interchangeability claim): 4820-01-431-1371, 4820-01-431-6669, 4820-01-431-6670. Verify interchangeability with system specifications before substitution.
What are the specifications of 803-6983468-PC032?
Key specifications for 803-6983468-PC032: Flange Seat to Disk End Height: 0.188 INCHES NOMINAL IN; Flange Diameter: 3.940 INCHES NOMINAL IN; Thread Length: 0.881 INCHES NOMINAL SINGLE THREADED PORTION IN; Style Designator: THREADED FLANGED. 12 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-431-1366 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.