NSN 4820-01-415-4939 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-415-4939. Manufacturer of record part number: 218015974.
The Retainer,disk,valve, cataloged under National Stock Number 4820-01-415-4939, 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 2 specifications, cited from the U.S. Government catalog. The record lists 7 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 12 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-415-4939
Primary Part Number
218015974
Item Name
Retainer,disk,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
Outside Diameter
4.114 INCHES NOMINAL IN
Material
ALUMINUM 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 Items12
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4730-01-415-6374211059841POSSIBLE MATCH
MANIFOLD ASSEMBLY,HYDRAULIC
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
4820-01-415-6660218016108POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-6661218016109POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-6662218015792POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-6664218015975POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-6665218015791POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-6666218015781POSSIBLE MATCH
CAP,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-7423218015780POSSIBLE MATCH
CAP,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-7428218015988 AND 218016108POSSIBLE MATCH
PARTS KIT,BALL VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-7431218012892 AND 218016109POSSIBLE MATCH
PARTS KIT,BALL VALVE
Possible match (shared part number)Naval Sea Systems Command
Huntington Ingalls Inc Div Newport News Shipbuilding
6406591
D/9Drawing number reference only
Naval Sea Systems Command
Related Parts
4730-01-415-6374POSSIBLE MATCH
MANIFOLD ASSEMBLY,HYDRAULIC
211059841
4820-01-415-6660POSSIBLE MATCH
SEAT,VALVE
218016108
4820-01-415-6661POSSIBLE MATCH
SEAT,VALVE
218016109
4820-01-415-6662POSSIBLE MATCH
STEM,FLUID VALVE
218015792
4820-01-415-6664POSSIBLE MATCH
DISK,VALVE
218015975
4820-01-415-6665POSSIBLE MATCH
STEM,FLUID VALVE
218015791
4820-01-415-6666POSSIBLE MATCH
CAP,VALVE
218015781
4820-01-415-7423POSSIBLE MATCH
CAP,VALVE
218015780
4820-01-415-7428POSSIBLE MATCH
PARTS KIT,BALL VALVE
218015988 AND 218016108
4820-01-415-7431POSSIBLE MATCH
PARTS KIT,BALL VALVE
218012892 AND 218016109
4730-01-417-8685POSSIBLE MATCH
MANIFOLD ASSEMBLY,HYDRAULIC
6406591-ASSY-C
4730-01-417-9063POSSIBLE MATCH
MANIFOLD ASSEMBLY,HYDRAULIC
6406591-ASSY-D
Frequently Asked Questions
What is NSN 4820-01-415-4939?
NSN 4820-01-415-4939 is a Retainer,disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-415-4939?
NSN 4820-01-415-4939 has 7 manufacturer part numbers on file: 211067467 (Naval Sea Systems Command), 556-6406591-MPAD-A25 (Naval Sea Systems Command), 211048868 (Naval Sea Systems Command), DF2300-4654 FN MPAD-A25 (Huntington Ingalls Inc Div Newport News Shipbuilding), 211084533 (Naval Sea Systems Command) and 2 more.
What NSN replaces 4820-01-415-4939?
12 possible matches (shared part number, not a government interchangeability claim): 4730-01-415-6374, 4820-01-415-6660, 4820-01-415-6661. Verify interchangeability with system specifications before substitution.
What are the specifications of 218015974?
Key specifications for 218015974: Outside Diameter: 4.114 INCHES NOMINAL IN; Overall Length: 3.250 INCHES NOMINAL IN; End Item Identification: SEAWOLF CLASS SSN; PUMP MANIFOLD HP/HS-061; Material: ALUMINUM ALLOY. 2 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-415-4939 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.