NSN 4820-01-413-6338 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-413-6338. Manufacturer of record part number: DF6503-173 AY-91.
Manufacturer of record: Huntington Ingalls Inc Div Newport News Shipbuilding
Identification
NSN: 4820-01-413-6338
NIIN: 014136338
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: DF6503-173 AY-91
Manufacturer: Huntington Ingalls Inc Div Newport News Shipbuilding
General Description
The Gear Operator,valve, cataloged under National Stock Number 4820-01-413-6338, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 8 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-413-6338
Primary Part Number
DF6503-173 AY-91
Item Name
Gear Operator,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Huntington Ingalls Inc Div Newport News Shipbuilding
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 Items8
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
3040-01-413-8891512-6404653-60POSSIBLE MATCH
SHAFT,STRAIGHT
Possible match (shared part number)Naval Sea Systems Command
3040-01-418-0064512-6404652-36POSSIBLE MATCH
WORM SHAFT
Possible match (shared part number)Naval Sea Systems Command
3040-01-418-4103512-6404652-40POSSIBLE MATCH
SHAFT,STRAIGHT
Possible match (shared part number)Naval Sea Systems Command
4820-01-418-6448512-6404652-AY95POSSIBLE MATCH
GEAR OPERATOR,VALVE
Possible match (shared part number)Naval Sea Systems Command
3010-01-418-9549211044863POSSIBLE MATCH
UNIVERSAL JOINT,NONVEHICULAR
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
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
Huntington Ingalls Inc Div Newport News Shipbuilding
211045130
3/2Design control — primary reference
U.S. Government activity
6404652
D/9Drawing number reference only
Naval Sea Systems Command
Related Parts
3040-01-413-8891POSSIBLE MATCH
SHAFT,STRAIGHT
512-6404653-60
3040-01-418-0064POSSIBLE MATCH
WORM SHAFT
512-6404652-36
3040-01-418-4103POSSIBLE MATCH
SHAFT,STRAIGHT
512-6404652-40
4820-01-418-6448POSSIBLE MATCH
GEAR OPERATOR,VALVE
512-6404652-AY95
3010-01-418-9549POSSIBLE MATCH
UNIVERSAL JOINT,NONVEHICULAR
211044863
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
Frequently Asked Questions
What is NSN 4820-01-413-6338?
NSN 4820-01-413-6338 is a Gear Operator,valve, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-413-6338?
NSN 4820-01-413-6338 has 2 manufacturer part numbers on file: DF6503-173 AY-91 (Huntington Ingalls Inc Div Newport News Shipbuilding), 512-6404652-AY91 (Naval Sea Systems Command).
What NSN replaces 4820-01-413-6338?
8 possible matches (shared part number, not a government interchangeability claim): 3040-01-413-8891, 3040-01-418-0064, 3040-01-418-4103. Verify interchangeability with system specifications before substitution.
What are the specifications of DF6503-173 AY-91?
Key specifications for DF6503-173 AY-91: Special Features: COMPONENT OF AIR INDUCTION AND DIESEL EXHAUST VALVES OPERATING GEAR & GAGGING ASSY;BACKUP VALVE MANUAL OPERATOR ASSY.; End Item Identification: SEAWOLF CLASS SSN. 0 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-413-6338 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.