NSN 4820-01-353-8522 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-353-8522. Manufacturer of record part number: 803-5959306-121-011.
The Retainer,disk,valve, cataloged under National Stock Number 4820-01-353-8522, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-353-8522
Primary Part Number
803-5959306-121-011
Item Name
Retainer,disk,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.
4820-01-353-8523803-5959306-T-211-010POSSIBLE MATCH
RETAINER,DISK,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-8454803-5959306-12X-005POSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-8456803-5959306-12X-007POSSIBLE MATCH
DISK,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-415-8458803-5959306-12X-011POSSIBLE MATCH
RETAINER,DISK,VALVE
Possible match (shared part number)Naval Sea Systems Command
4820-01-489-1488803-5959306-3XX-051PEEKPOSSIBLE MATCH
STEM,FLUID VALVE
Possible match (shared part number)Electric Boat Corporation Div General Dynamics Electric Boat
NSN 4820-01-353-8522 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 4820-01-353-8522?
NSN 4820-01-353-8522 has 1 manufacturer part number on file: 803-5959306-121-011 (Naval Sea Systems Command).
What NSN replaces 4820-01-353-8522?
5 possible matches (shared part number, not a government interchangeability claim): 4820-01-353-8523, 4820-01-415-8454, 4820-01-415-8456. Verify interchangeability with system specifications before substitution.
What are the specifications of 803-5959306-121-011?
Key specifications for 803-5959306-121-011: Special Features: TITANIUM ASTM B348 GR 2;0.478 IN. OD;0.406 IN. H IN. 0 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-353-8522 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.