The Indicator,sight,liquid, cataloged under National Stock Number 6680-01-505-6509, 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 Caterpillar Inc Div Caterpillar Defense. Government technical data includes 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6680-01-505-6509 |
| Primary Part Number | 158-6246 |
| Item Name | Indicator,sight,liquid |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Furnished Data | LIQUID LEVEL |
| Style Designator | VERTICAL SHIELDED, SINGLE PORT |
| 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 |
|---|---|
| 158-6246 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 7W-0522 ITEM 3 | 5/1 Secondary reference Caterpillar Inc Div Caterpillar Defense |
| 7W-0522 | D/9 Drawing number reference only Caterpillar Inc Div Caterpillar Defense |
NSN 6680-01-505-6509 is a Indicator,sight,liquid, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-505-6509 has 1 manufacturer part number on file: 158-6246 (Caterpillar Inc Div Caterpillar Defense).
1 possible match (shared part number, not a government interchangeability claim): 4930-01-505-8822. Verify interchangeability with system specifications before substitution.
Key specifications for 158-6246: Furnished Data: LIQUID LEVEL; Style Designator: VERTICAL SHIELDED, SINGLE PORT; Special Features: INAVY)GAUGE-SIGHT;(DRAWING)3516B GENERATOR SET FDN(7W-0522) W; End Item Identification: LUBRICATOR GP-AIR MTR. 2 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.