The Tachometer,mechanical,fixed Moun, cataloged under National Stock Number 6680-01-522-1815, 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 Stewart-Warner Corporation. Government technical data includes 8 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 6680-01-522-1815 |
| Primary Part Number | 551-AHL-D |
| Item Name | Tachometer,mechanical,fixed Moun |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Stewart-Warner Corporation |
| Status | ACTIVE |
| Scale Quantity | 3500 |
| Dial Illumination | NOT PROVIDED |
| Scale Measurement Unit | REVOLUTIONS PER MINUTE |
| Pointer Quantity | 1 |
| Pointer Movement Direction | CLOCKWISE |
| Case Shape | ROUND |
| Dial Background Color | BLACK, DULL |
| Mounting Type | BRACKET |
| 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 |
|---|---|
| 551-AHL-D PRIMARY | Stewart-Warner Corporation (USA) |
| Reference | Meaning |
|---|---|
| HG101 | 5/9 Secondary reference Pennwalt Corp S S White Industrial Products Div |
| 93016A7003 | 7/2 Vendor item drawing reference Marine Corps Systems Command Div Marine Corps Systems Command Technical Data Repository Customer Service |
NSN 6680-01-522-1815 is a Tachometer,mechanical,fixed Moun, manufactured by Stewart-Warner Corporation, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-522-1815 has 1 manufacturer part number on file: 551-AHL-D (Stewart-Warner Corporation).
Key specifications for 551-AHL-D: Scale Quantity: 3500; Dial Illumination: NOT PROVIDED; Scale Measurement Unit: REVOLUTIONS PER MINUTE; Pointer Quantity: 1. 8 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.