NSN 4820-01-418-6448 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-418-6448. Manufacturer of record part number: 512-6404652-AY95.
The Gear Operator,valve, cataloged under National Stock Number 4820-01-418-6448, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-418-6448
Primary Part Number
512-6404652-AY95
Item Name
Gear Operator,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
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.
3040-01-444-5114512-6404652 FIND 148POSSIBLE MATCH
PLATE,RETAINING,SHAFT
Possible match (shared part number)Naval Sea Systems Command
4820-01-444-9493512-6404652-AY89POSSIBLE MATCH
GEAR OPERATOR,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-446-5079211045128POSSIBLE MATCH
GEAR OPERATOR,VALVE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-446-5125211045124POSSIBLE MATCH
PISTON,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-449-0093512-6404652-AY92POSSIBLE MATCH
GEAR OPERATOR,VALVE
Possible match (shared part number)Naval Sea Systems Command
Huntington Ingalls Inc Div Newport News Shipbuilding
Related Parts
3040-01-444-5114POSSIBLE MATCH
PLATE,RETAINING,SHAFT
512-6404652 FIND 148
4820-01-444-9493POSSIBLE MATCH
GEAR OPERATOR,VALVE
512-6404652-AY89
4820-01-446-5079POSSIBLE MATCH
GEAR OPERATOR,VALVE
211045128
4820-01-446-5125POSSIBLE MATCH
PISTON,VALVE
211045124
4820-01-449-0093POSSIBLE MATCH
GEAR OPERATOR,VALVE
512-6404652-AY92
Frequently Asked Questions
What is NSN 4820-01-418-6448?
NSN 4820-01-418-6448 is a Gear Operator,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-418-6448?
NSN 4820-01-418-6448 has 1 manufacturer part number on file: 512-6404652-AY95 (Naval Sea Systems Command).
What NSN replaces 4820-01-418-6448?
5 possible matches (shared part number, not a government interchangeability claim): 3040-01-444-5114, 4820-01-444-9493, 4820-01-446-5079. Verify interchangeability with system specifications before substitution.
What are the specifications of 512-6404652-AY95?
Key specifications for 512-6404652-AY95: Special Features: COMPONENT OF AIR INDUCTION AND DIESEL EXHAUST VALVES OPERATING GEAR & GAGGING GEAR ASSY.;HULL VALVE OUTBOARD OPERATOR ASSY.; End Item Identification: SEAWOLF CLASS SSN. 0 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-418-6448 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.