NSN 4820-01-549-6381 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-549-6381. Manufacturer of record part number: 7550478-264382003-029.
The Seat,valve, cataloged under National Stock Number 4820-01-549-6381, 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 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 11 items share a part number with this NSN in the catalog (possible match — not a government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
4820-01-549-6381
Primary Part Number
7550478-264382003-029
Item Name
Seat,valve
FSC / FSG
4820 / 48 — Valves, Nonpowered
Manufacturer
Naval Sea Systems Command
Status
ACTIVE
Specification/standard Data
96169 - EB4147 MANUFACTURERS SPECIFICATION
Material
PLASTIC ACRYLATE OVERALL
Lifecycle & Compliance
Acquisition Status
ACTIVE
DEMIL Code
DEMIL A — No Demilitarization Required
Hazard
No hazard code in the DLA record (HMIC N)
Criticality Code
S
⇄Related Items11
Each row states its source: a government interchangeability/replacement code, or a possible match on a shared part number.
4820-01-550-3304POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)
4820-01-550-3342POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)
4820-01-550-3348POSSIBLE MATCH
DAMPER,VALVE
Possible match (shared part number)
4820-01-550-3694POSSIBLE MATCH
NOZZLE,VALVE
Possible match (shared part number)
4820-01-550-3699POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)
4820-01-550-3716POSSIBLE MATCH
SEAT,VALVE
Possible match (shared part number)
4820-01-553-460030-1111-XXXPOSSIBLE MATCH
VALVE,CHECK
Possible match (shared part number)Tescom Corp Dba Tescom Div Tescom
4820-01-553-4606VPB1000079POSSIBLE MATCH
VALVE,LINEAR,DIRECTIONAL CONTROL
Possible match (shared part number)Value Plastics, Inc. Div Nordson Medical
6685-01-554-8812Q3CPOSSIBLE MATCH
INDICATOR,PRESSURE
Possible match (shared part number)Mcdaniel Control Inc
6685-01-554-88217550478-DES-021704-11POSSIBLE MATCH
INDICATOR,PRESSURE
Possible match (shared part number)Naval Sea Systems Command
NSN 4820-01-549-6381 is a Seat,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
What part numbers are listed for NSN 4820-01-549-6381?
NSN 4820-01-549-6381 has 3 manufacturer part numbers on file: 7550478-264382003-029CP (Naval Inventory Control Point Mechanicsburg), 2643-820-03 ITEM 29CP (Naval Inventory Control Point Mechanicsburg), 7550478-264382003-029 (Naval Sea Systems Command).
What NSN replaces 4820-01-549-6381?
11 possible matches (shared part number, not a government interchangeability claim): 4820-01-550-3304, 4820-01-550-3342, 4820-01-550-3348. Verify interchangeability with system specifications before substitution.
What are the specifications of 7550478-264382003-029?
Key specifications for 7550478-264382003-029: Specification/standard Data: 96169 - EB4147 MANUFACTURERS SPECIFICATION; Special Features: OXYGEN CLEANED. CLEANING & PACKAGING IN ACCORDANCE WITH MIL-STD-1330D; End Item Identification: 4820-01-548-7732; SSGN TRIDENT; Material: PLASTIC ACRYLATE OVERALL. 2 specifications are documented in the U.S. Government catalog.
Is NSN 4820-01-549-6381 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.