The Indicator,electrical Tachometer, cataloged under National Stock Number 6680-01-157-5346, 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 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6680-01-157-5346 |
| Primary Part Number | 481BL |
| Item Name | Indicator,electrical Tachometer |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Stewart-Warner Corporation |
| Status | ACTIVE |
| Individual Marking | ODOMETER |
| Scale Range | -0.1 TO 3500.0 REVOLUTIONS PER MINUTE SINGLE INDICATOR SINGLE SCALE |
| Presentation Type | ELECTRON TUBE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 6680-01-157-5346 is a Indicator,electrical Tachometer, manufactured by Stewart-Warner Corporation, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-157-5346 has 2 manufacturer part numbers on file: QM481BL (Atap Inc), 481BL (Stewart-Warner Corporation).
1 possible match (shared part number, not a government interchangeability claim): 6620-01-206-8915. Verify interchangeability with system specifications before substitution.
Key specifications for 481BL: Individual Marking: ODOMETER; Scale Range: -0.1 TO 3500.0 REVOLUTIONS PER MINUTE SINGLE INDICATOR SINGLE SCALE; Presentation Type: ELECTRON TUBE. 3 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.