The Seat,valve, cataloged under National Stock Number 4820-01-304-2649, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
Catalog Facts
Item Name
Seat,valve
FSC / FSG
4820 — Valves, Nonpowered (FSG 48)
Technical Specifications
Parameter
Value
NSN
4820-01-304-2649
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Status
ACTIVE
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
⇄Related Items3
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-428-9775311233POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Leslie Controls, Inc. Dba Leslie Controls Inc
1560-01-691-79073-11233-20BPOSSIBLE MATCH
PANEL,STRUCTURAL,AIRCRAFT
Possible match (shared part number)Northrop Grumman Systems Corporation Dba Northrop Grumman Is Div Northrop Grumman Aeronautics Systems
5962-01-723-5839311233-1POSSIBLE MATCH
MICROCIRCUIT,MEMORY
Possible match (shared part number)Lockheed Martin Sippican, Inc. Div Lockheed Martin Marion
Cross-Reference Index
No manufacturer part numbers on file in the U.S. Government catalog.
Reference documents
Reference
Meaning
311233
3/9Design control — primary reference
Circor Intl Inc
Related Parts
4820-01-428-9775POSSIBLE MATCH
SEAT,VALVE
311233
1560-01-691-7907POSSIBLE MATCH
PANEL,STRUCTURAL,AIRCRAFT
3-11233-20B
5962-01-723-5839POSSIBLE MATCH
MICROCIRCUIT,MEMORY
311233-1
Frequently Asked Questions
What is NSN 4820-01-304-2649?
NSN 4820-01-304-2649 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
What NSN replaces 4820-01-304-2649?
3 possible matches (shared part number, not a government interchangeability claim): 4820-01-428-9775, 1560-01-691-7907, 5962-01-723-5839. Verify interchangeability with system specifications before substitution.
Is NSN 4820-01-304-2649 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.