The Indicator,sight,liquid, cataloged under National Stock Number 6680-00-044-0660, 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. The manufacturer of record is Frc Electrical Industries Inc. Government technical data includes 6 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6680-00-044-0660 |
| Primary Part Number | HTW4 |
| Item Name | Indicator,sight,liquid |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Frc Electrical Industries Inc |
| Status | ACTIVE |
| Width Across Flats | 1.437 INCHES NOMINAL IN |
| Nominal Pipe Size for Which Designed | UNABLE TO DECODE |
| Data Furnishing Method | CLEAR WINDOW |
| Maximum Working Pressure | 5000.0 POUNDS PER SQUARE INCH (PSI) LBS |
| Material | STEEL |
| Sight Diameter | 0.925 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 |
| Part Number | Manufacturer |
|---|---|
| HTW4 PRIMARY | Frc Electrical Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| PK-18797 | 5/9 Secondary reference Lodestone Corp Div of Fedders Corp |
| 524261 | 5/9 Secondary reference Lodestone Corp Div of Fedders Corp |
NSN 6680-00-044-0660 is a Indicator,sight,liquid, manufactured by Frc Electrical Industries Inc, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-00-044-0660 has 1 manufacturer part number on file: HTW4 (Frc Electrical Industries Inc).
Key specifications for HTW4: Overall Height: 1.000 INCHES NOMINAL IN; Width Across Flats: 1.437 INCHES NOMINAL IN; Nominal Pipe Size for Which Designed: UNABLE TO DECODE; Data Furnishing Method: CLEAR WINDOW. 6 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.