NSN 4820-01-375-8018 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-375-8018. Manufacturer of record part number: 801-6641184FNA10.
Operating Pressure: 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Adjustable Pressure Range: +200.0 TO 400.0 POUNDS PER SQUARE INCH LBS
Maximum Operating Temp: 160.0 FAHRENHEIT SINGLE RESPONSE DEGF
Media for Which Designed: HYDRAULIC FLUID, PETROLEUM BASE SINGLE RESPONSE
Valve Operation Method: AUTOMATIC
Identification
NSN: 4820-01-375-8018
NIIN: 013758018
FSC: 4820 — Valves, Nonpowered
FSG: 48 — Valves
Primary part number: 801-6641184FNA10
Manufacturer: Naval Sea Systems Command
General Description
The Valve,safety Relief, cataloged under National Stock Number 4820-01-375-8018, 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 7 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-375-8018
Primary Part Number
801-6641184FNA10
Item Name
Valve,safety Relief
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
Flow Control Device
POPPET
Style Designator
STRAIGHT THRU
Operating Pressure
400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS
Adjustable Pressure Range
+200.0 TO 400.0 POUNDS PER SQUARE INCH LBS
Maximum Operating Temp
160.0 FAHRENHEIT SINGLE RESPONSE DEGF
Media for Which Designed
HYDRAULIC FLUID, PETROLEUM BASE SINGLE RESPONSE
Valve Operation Method
AUTOMATIC
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.
4820-01-375-8106801-6641184FNA7POSSIBLE MATCH
HEAD,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-375-8107801-6641184FNA8POSSIBLE MATCH
HEAD,VALVE
Possible match (shared part number)Naval Sea Systems Command
3020-01-375-81456641184 FIND A6POSSIBLE MATCH
GEAR,SPUR
Possible match (shared part number)Naval Sea Systems Command
4820-01-375-8577801-6641184FNA5POSSIBLE MATCH
RACK,PISTON
Possible match (shared part number)Naval Sea Systems Command
4710-01-375-8578801-6641184FNA4POSSIBLE MATCH
TUBE,CYLINDER
Possible match (shared part number)Naval Sea Systems Command
NSN 4820-01-375-8018 is a Valve,safety Relief, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-375-8018?
NSN 4820-01-375-8018 has 1 manufacturer part number on file: 801-6641184FNA10 (Naval Sea Systems Command).
What NSN replaces 4820-01-375-8018?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-375-8106, 4820-01-375-8107, 3020-01-375-8145. Verify interchangeability with system specifications before substitution.
What are the specifications of 801-6641184FNA10?
Key specifications for 801-6641184FNA10: Flow Control Device: POPPET; Style Designator: STRAIGHT THRU; Operating Pressure: 400.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Adjustable Pressure Range: +200.0 TO 400.0 POUNDS PER SQUARE INCH LBS. 7 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-375-8018 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.