The Indicator,sight,liquid, cataloged under National Stock Number 6680-00-100-4528, is classified within Federal Supply Class 6680 (Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments) of the Instruments and Laboratory Equipment group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-00-100-4528 |
| Item Name | Indicator,sight,liquid |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Status | ACTIVE |
| Furnished Data | LIQUID LEVEL |
| Nominal Pipe Size for Which Designed | UNABLE TO DECODE |
| Data Furnishing Method | CLEAR WINDOW |
| Supplementary Features | SPARROW AIR TO AIR MISSILE |
| End Connection Type | UNABLE TO DECODE |
| Style Designator | DOUBLE-MOUNT, SHIELDED, FRONT OPENING |
| Features Provided | PORT SEAL CAP |
| Distance Between Mounting Facility Centers | 7.000 INCHES NOMINAL IN |
| Thread Direction | UNABLE TO DECODE |
| Nominal Thread Size | UNABLE TO DECODE |
| Maximum Temp Rating | 225.0 FAHRENHEIT DEGF |
| Surface Treatment | ZINC |
| Media for Which Designed | OIL |
| Thread Class | UNABLE TO DECODE |
| Maximum Working Pressure | 125.0 POUNDS PER SQUARE INCH (PSI) LBS |
| Material | STEEL |
| Thread Series Designator | UNABLE TO DECODE |
| Sight Height | 5.500 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| B1556-1X42 | 3/2 Design control — primary reference U.S. Government activity |
| A-4154 | 5/1 Secondary reference U.S. Government activity |
| A-3341-7CL | 5/1 Secondary reference U.S. Government activity |
NSN 6680-00-100-4528 is a Indicator,sight,liquid, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 5310-00-202-3680. Verify interchangeability with system specifications before substitution.
Key specifications for 6680-00-100-4528: Overall Height: 8.000 INCHES NOMINAL IN; Furnished Data: LIQUID LEVEL; Nominal Pipe Size for Which Designed: UNABLE TO DECODE; Data Furnishing Method: CLEAR WINDOW. 18 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
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.