PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

545-9Glass,liquid Sight Indicator,fla

Ernst, John C & Co, Inc. · NSN 6680-01-525-3081 · FSC 6680 · No Item Name Available
Verified by PartsTable
NSN 6680-01-525-3081 — this item is cataloged by the U.S. Government under National Stock Number 6680-01-525-3081. Primary manufacturer part number: 545-9.
Features
  • Glass,liquid Sight Indicator,fla — FSC 6680
  • Design Type: REFLEX
  • Gage Rated Pressure: 4000.0 POUNDS PER SQUARE INCH LBS
  • 2 verified cross-references
  • Primary manufacturer: Ernst, John C & Co, Inc.
Applications
  • Industrial maintenance and repair
  • Government and military logistics
  • Equipment overhaul and refurbishment
General Description

The Glass,liquid Sight Indicator,fla, cataloged under National Stock Number 6680-01-525-3081, is classified within Federal Supply Class 6680 (No Item Name Available) of the Instruments and Laboratory Equipment group. The primary manufacturer of record is Ernst, John C & Co, Inc.. Government technical data includes 2 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. 2 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6680-01-525-3081
Primary Part Number545-9
Item NameGlass,liquid Sight Indicator,fla
FSC / FSG6680 / 66 — No Item Name Available
ManufacturerErnst, John C & Co, Inc.
StatusACTIVE
Design TypeREFLEX
Gage Rated Pressure4000.0 POUNDS PER SQUARE INCH LBS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 2
5330-00-594-54072C2736 INTERCHANGEABLE
Packing,preformed
Cascade Corp
5940-01-058-90943D2098 INTERCHANGEABLE
Terminal,lug
Caterpillar Inc Div Caterpillar Defense
Cross-Reference Index
Part NumberManufacturer
545-9 PRIMARY Ernst, John C & Co, Inc. (USA)
P480-R19ASS-48 Ernst, John C & Co, Inc. (USA)
Related Parts
5330-00-594-5407INTERCHANGEABLE
PACKING,PREFORMED
2C2736
5940-01-058-9094INTERCHANGEABLE
TERMINAL,LUG
3D2098

Frequently Asked Questions

What is NSN 6680-01-525-3081?

NSN 6680-01-525-3081 is a Glass,liquid Sight Indicator,fla, manufactured by Ernst, John C & Co, Inc., classified under FSC 6680 (No Item Name Available). Status: active.

What are the part numbers for NSN 6680-01-525-3081?

NSN 6680-01-525-3081 has 2 cross-referenced part numbers: 545-9 (Ernst, John C & Co, Inc.), P480-R19ASS-48 (Ernst, John C & Co, Inc.).

What NSN replaces 6680-01-525-3081?

There are 2 known substitutes for 6680-01-525-3081: 5330-00-594-5407, 5940-01-058-9094. Verify interchangeability with system specifications before substitution.

What are the specifications of 545-9?

Key specifications for 545-9: Overall Length: 12.625 INCHES NOMINAL IN; Special Features: MATERIAL: BOROSILICATE; Design Type: REFLEX; End Item Identification: GAGE, LIQUID LEVEL. 6 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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