PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

52666Retainer,seat,valve

Eaton Aerospace Llc Dba Eaton Aerospace Jackson · NSN 4820-01-664-8777 · FSC 4820 · No Item Name Available
Verified by PartsTable
NSN 4820-01-664-8777 — this item is cataloged by the U.S. Government under National Stock Number 4820-01-664-8777. Primary manufacturer part number: 52666.
Features
  • Retainer,seat,valve — FSC 4820
  • 1 verified cross-reference
  • Primary manufacturer: Eaton Aerospace Llc Dba Eaton Aerospace Jackson
Applications
  • Flow control in piping systems
  • Pressure regulation
  • Steam and fluid isolation
General Description

The Retainer,seat,valve, cataloged under National Stock Number 4820-01-664-8777, is classified within Federal Supply Class 4820 (No Item Name Available) of the Valves group. The primary manufacturer of record is Eaton Aerospace Llc Dba Eaton Aerospace Jackson. This item has 1 commercial cross-reference from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 4 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Catalog Facts
Item NameRetainer,seat,valve
FSC / FSG4820 — No Item Name Available (FSG 48)
ManufacturersEaton Aerospace Llc Dba Eaton Aerospace Jackson (CAGE 99643)
Technical Specifications
ParameterValue
NSN4820-01-664-8777
Primary Part Number52666
Item NameRetainer,seat,valve
FSC / FSG4820 / 48 — No Item Name Available
ManufacturerEaton Aerospace Llc Dba Eaton Aerospace Jackson
StatusACTIVE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 4
5310-00-358-3797020064 INTERCHANGEABLE
Washer,flat
Thermo King Corporation Dba Phoenix Global Distirbution.
5995-01-259-902652666 INTERCHANGEABLE
Cable Assembly,radio Frequency
Semflex, Inc.
6520-01-594-196352666 INTERCHANGEABLE
Ringless System,dental Casting
Bego Usa Inc
5130-01-631-2621 INTERCHANGEABLE
Grinder,portable
Cross-Reference Index
Part NumberManufacturer
52666 PRIMARY Eaton Aerospace Llc Dba Eaton Aerospace Jackson (USA)
Related Parts
5310-00-358-3797INTERCHANGEABLE
WASHER,FLAT
020064
5995-01-259-9026INTERCHANGEABLE
CABLE ASSEMBLY,RADIO FREQUENCY
52666
6520-01-594-1963INTERCHANGEABLE
RINGLESS SYSTEM,DENTAL CASTING
52666
5130-01-631-2621INTERCHANGEABLE
GRINDER,PORTABLE

Frequently Asked Questions

What is NSN 4820-01-664-8777?

NSN 4820-01-664-8777 is a Retainer,seat,valve, manufactured by Eaton Aerospace Llc Dba Eaton Aerospace Jackson, classified under FSC 4820 (No Item Name Available). Status: active.

What are the part numbers for NSN 4820-01-664-8777?

NSN 4820-01-664-8777 has 1 cross-referenced part number: 52666 (Eaton Aerospace Llc Dba Eaton Aerospace Jackson).

What NSN replaces 4820-01-664-8777?

There are 4 known substitutes for 4820-01-664-8777: 5310-00-358-3797, 5995-01-259-9026, 6520-01-594-1963 and 1 more. Verify interchangeability with system specifications before substitution.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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