NSN 4820-01-434-7959 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-434-7959. Manufacturer of record part number: 6405751 AHCA FIND 2.
The Flange,gland,valve, cataloged under National Stock Number 4820-01-434-7959, 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 6 specifications, cited from the U.S. Government catalog. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 11 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-434-7959
Primary Part Number
6405751 AHCA FIND 2
Item Name
Flange,gland,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
Flange Shape
ROUND
Bolt Hole Nominal Diameter
0.406 INCHES IN
Bolt Hole Quantity
6
Flange Diameter
5.000 INCHES IN
Nominal Center Hole Diameter
2.003 INCHES IN
Material
NICKEL ALLOY
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 Items11
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
3020-01-444-2745211070548POSSIBLE MATCH
GEAR,MITER
Possible match (shared part number)Naval Sea Systems Command
3040-01-444-29096111404-A6POSSIBLE MATCH
GEARSHAFT,SPUR
Possible match (shared part number)Naval Sea Systems Command
3020-01-444-2914211070549POSSIBLE MATCH
GEAR,SPUR
Possible match (shared part number)Naval Sea Systems Command
3010-01-444-3353218027410POSSIBLE MATCH
UNIVERSAL JOINT,NONVEHICULAR
Possible match (shared part number)Naval Sea Systems Command
3010-01-444-3356211070544POSSIBLE MATCH
UNIVERSAL JOINT,NONVEHICULAR
Possible match (shared part number)Naval Sea Systems Command
3040-01-444-4165C611-1404 FIND AHCA A8POSSIBLE MATCH
SHAFT,SHOULDERED
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
3040-01-444-42946111404-C10POSSIBLE MATCH
SHAFT,SHOULDERED
Possible match (shared part number)Naval Sea Systems Command
3040-01-444-4341C611-1404 FIND AHCA C2POSSIBLE MATCH
SHAFT,SHOULDERED
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
3040-01-444-43736405751 AHCA A9POSSIBLE MATCH
SHAFT,SHOULDERED
Possible match (shared part number)Naval Sea Systems Command
3040-01-450-31086111404-A4POSSIBLE MATCH
JAW,ANCHOR CHAIN MECHANISM
Possible match (shared part number)Naval Sea Systems Command
Huntington Ingalls Inc Div Newport News Shipbuilding
C611-1404
D/9Drawing number reference only
U.S. Government activity
6405751
D/9Drawing number reference only
Naval Sea Systems Command
C611-1404 AHCA FIND 2
5/2Secondary reference
U.S. Government activity
Related Parts
3020-01-444-2745POSSIBLE MATCH
GEAR,MITER
211070548
3040-01-444-2909POSSIBLE MATCH
GEARSHAFT,SPUR
6111404-A6
3020-01-444-2914POSSIBLE MATCH
GEAR,SPUR
211070549
3010-01-444-3353POSSIBLE MATCH
UNIVERSAL JOINT,NONVEHICULAR
218027410
3010-01-444-3356POSSIBLE MATCH
UNIVERSAL JOINT,NONVEHICULAR
211070544
3040-01-444-4165POSSIBLE MATCH
SHAFT,SHOULDERED
C611-1404 FIND AHCA A8
3040-01-444-4294POSSIBLE MATCH
SHAFT,SHOULDERED
6111404-C10
3040-01-444-4341POSSIBLE MATCH
SHAFT,SHOULDERED
C611-1404 FIND AHCA C2
3040-01-444-4373POSSIBLE MATCH
SHAFT,SHOULDERED
6405751 AHCA A9
3040-01-450-3108POSSIBLE MATCH
JAW,ANCHOR CHAIN MECHANISM
6111404-A4
3010-01-494-7397POSSIBLE MATCH
COUPLING HALF,SHAFT
581-6405751 FIND 9
Frequently Asked Questions
What is NSN 4820-01-434-7959?
NSN 4820-01-434-7959 is a Flange,gland,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-434-7959?
NSN 4820-01-434-7959 has 4 manufacturer part numbers on file: 6405751 AHCA FIND 2 (Naval Sea Systems Command), 6111404-2 (Naval Sea Systems Command), 211015571 (Naval Sea Systems Command), 581-6405751 AHCA FIND 2 (Naval Sea Systems Command).
What NSN replaces 4820-01-434-7959?
11 possible matches (shared part number, not a government interchangeability claim): 3020-01-444-2745, 3040-01-444-2909, 3020-01-444-2914. Verify interchangeability with system specifications before substitution.
What are the specifications of 6405751 AHCA FIND 2?
Key specifications for 6405751 AHCA FIND 2: Flange Shape: ROUND; Bolt Hole Nominal Diameter: 0.406 INCHES IN; Bolt Hole Quantity: 6; Flange Diameter: 5.000 INCHES IN. 6 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-434-7959 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.