The Indicator,electrical Tachometer, cataloged under National Stock Number 6680-01-490-4443, 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 Dynalec Corporation. Government technical data includes 14 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6680-01-490-4443 |
| Primary Part Number | PK420-1 |
| Item Name | Indicator,electrical Tachometer |
| FSC / FSG | 6680 / 66 — Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments |
| Manufacturer | Dynalec Corporation |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 4 UNTHREADED HOLE(S) |
| Contact Type | SOCKET |
| Mounting Arrangement Style | FOUR HOLE/STUD RECTANGULAR/SQUARE |
| Length | 5.000 INCHES NOMINAL IN |
| Display Digit Quantity | 6 |
| Electrical Connection Quantity | 1 |
| Center to Center Distance Between Mounting Facilities Parallel to Length | 4.500 INCHES NOMINAL IN |
| Mounting Hole Diameter | 0.156 INCHES NOMINAL IN |
| Contact Quantity | 15 |
| Presentation Type | DIGITAL DISPLAY |
| Depth | 5.750 INCHES NOMINAL IN |
| Width | 2.750 INCHES NOMINAL IN |
| Center to Center Distance Between Mounting Facilities Parallel to Width | 2.120 INCHES NOMINAL IN |
| Material | ALUMINUM CASE |
| 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 |
|---|---|
| 437-8357206-011 | Naval Sea Systems Command (USA) |
| PK420-1 PRIMARY | Dynalec Corporation (USA) |
| Reference | Meaning |
|---|---|
| B2094 | D/9 Drawing number reference only The Electric Tachometer Corp. |
| PK420-1 | 5/9 Secondary reference The Electric Tachometer Corp. |
| 437-7015396-105 | D/9 Drawing number reference only Naval Sea Systems Command |
| H749-7721-105 | D/9 Drawing number reference only U.S. Government activity |
NSN 6680-01-490-4443 is a Indicator,electrical Tachometer, manufactured by Dynalec Corporation, classified under FSC 6680, Liquid and Gas Flow, Liquid Level, and Mechanical Motion Measuring Instruments. Status: active.
NSN 6680-01-490-4443 has 2 manufacturer part numbers on file: 437-8357206-011 (Naval Sea Systems Command), PK420-1 (Dynalec Corporation).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-493-1628. Verify interchangeability with system specifications before substitution.
Key specifications for PK420-1: Mounting Facility Type and Quantity: 4 UNTHREADED HOLE(S); Contact Type: SOCKET; Mounting Arrangement Style: FOUR HOLE/STUD RECTANGULAR/SQUARE; Length: 5.000 INCHES NOMINAL IN. 14 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.