PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

S52KIndicator,sight,liquid

Eaton Aerospace Llc Div Fluid and Electrical Distribution Division · NSN 6680-00-840-5573 · FSC 6680 · No Item Name Available
Verified by PartsTable
NSN 6680-00-840-5573 — this item is cataloged by the U.S. Government under National Stock Number 6680-00-840-5573. Primary manufacturer part number: S52K.
Features
  • Indicator,sight,liquid — FSC 6680
  • Width Across Flats: 1.875 INCHES NOMINAL IN
  • Data Furnishing Method: CLEAR WINDOW
  • Nominal Thread Size: UNABLE TO DECODE
  • Media for Which Designed: OIL
  • End Connection Type: UNABLE TO DECODE
  • Thread Series Designator: UNABLE TO DECODE
  • Thread Quantity Per Inch: UNABLE TO DECODE
Applications
  • Applications requiring Aluminum Alloy construction
General Description

The Indicator,sight,liquid, cataloged under National Stock Number 6680-00-840-5573, is classified within Federal Supply Class 6680 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Eaton Aerospace Llc Div Fluid and Electrical Distribution Division. Government technical data includes 15 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6680-00-840-5573
Primary Part NumberS52K
Item NameIndicator,sight,liquid
FSC / FSG6680 / 66 — No Item Name Available
ManufacturerEaton Aerospace Llc Div Fluid and Electrical Distribution Division
StatusACTIVE
Width Across Flats1.875 INCHES NOMINAL IN
Data Furnishing MethodCLEAR WINDOW
Nominal Thread SizeUNABLE TO DECODE
Media for Which DesignedOIL
End Connection TypeUNABLE TO DECODE
Thread Series DesignatorUNABLE TO DECODE
Thread Quantity Per InchUNABLE TO DECODE
Style DesignatorBULLS EYE
MaterialALUMINUM ALLOY
Surface TreatmentANODIZE
Furnished DataLIQUID LEVEL
Thread ClassUNABLE TO DECODE
Sight Diameter1.313 INCHES NOMINAL IN
Tube Outside Diameter for Which DesignedUNABLE TO DECODE
Thread DirectionUNABLE TO DECODE
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
6240-00-155-790452 INTERCHANGEABLE
Lamp,incandescent
Lamp Industry for Use with Industry Designations and Abbreviations for Lamps
3455-00-250-07711743-0375 INTERCHANGEABLE
Cutter,milling,end
New York Twist Drill Inc
6625-00-420-3862S52 INTERCHANGEABLE
Plug-in Unit,electrical-Electron
Tektronix, Inc.
5340-00-527-9912S52 INTERCHANGEABLE
Plunger,quick Release
Hutchinson Aerospace & Industry, Inc. Dba Vlier Div Vlier
6680-00-766-1880321094-1 INTERCHANGEABLE
Indicator,sight,liquid
Naval Air Warfare Center Aircraft Division Joint Base Jbmdl
5340-00-949-9637S-52 INTERCHANGEABLE
Plunger,detent
Napco Intl Inc
Cross-Reference Index
Part NumberManufacturer
S52 Eaton Aerospace Llc Div Fluid and Electrical Distribution Division (USA)
S52K PRIMARY Eaton Aerospace Llc Div Fluid and Electrical Distribution Division (USA)
Related Parts
6240-00-155-7904INTERCHANGEABLE
LAMP,INCANDESCENT
52
3455-00-250-0771INTERCHANGEABLE
CUTTER,MILLING,END
1743-0375
6625-00-420-3862INTERCHANGEABLE
PLUG-IN UNIT,ELECTRICAL-ELECTRON
S52
5340-00-527-9912INTERCHANGEABLE
PLUNGER,QUICK RELEASE
S52
6680-00-766-1880INTERCHANGEABLE
INDICATOR,SIGHT,LIQUID
321094-1
5340-00-949-9637INTERCHANGEABLE
PLUNGER,DETENT
S-52

Frequently Asked Questions

What is NSN 6680-00-840-5573?

NSN 6680-00-840-5573 is a Indicator,sight,liquid, manufactured by Eaton Aerospace Llc Div Fluid and Electrical Distribution Division, classified under FSC 6680 (No Item Name Available). Status: active.

What are the part numbers for NSN 6680-00-840-5573?

NSN 6680-00-840-5573 has 2 cross-referenced part numbers: S52 (Eaton Aerospace Llc Div Fluid and Electrical Distribution Division), S52K (Eaton Aerospace Llc Div Fluid and Electrical Distribution Division).

What NSN replaces 6680-00-840-5573?

There are 6 known substitutes for 6680-00-840-5573: 6240-00-155-7904, 3455-00-250-0771, 6625-00-420-3862 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of S52K?

Key specifications for S52K: Width Across Flats: 1.875 INCHES NOMINAL IN; Data Furnishing Method: CLEAR WINDOW; Nominal Thread Size: UNABLE TO DECODE; Media for Which Designed: OIL. 16 total characteristics are documented in the Federal Logistics Information System.

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