The Indicator,electrical Tachometer, cataloged under National Stock Number 6620-01-129-7247, is classified within Federal Supply Class 6620 (Engine Instruments) of the Instruments and Laboratory Equipment group. Government technical data includes 23 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6620-01-129-7247 |
| Item Name | Indicator,electrical Tachometer |
| FSC / FSG | 6620 / 66 — Engine Instruments |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 1 THREADED BEZEL |
| Phase | SINGLE |
| Contact Type | PIN |
| Scale Marking | NUMERALS |
| Length | 6.000 INCHES NOMINAL IN |
| AC Voltage Rating | 5.0 VOLTS NOMINAL |
| Current Type | AC/DC |
| Electrical Connection Quantity | 1 |
| DC Voltage Rating | 28.0 VOLTS NOMINAL |
| Electrical Connection Identifying Number | SHALL MATE WITH M83723-75R12126 |
| Accuracy Rating | 1.0 PERCENT REVOLUTIONS PER MINUTE SINGLE INDICATOR SINGLE SCALE |
| Supplementary Features | CASE PER MS33639 |
| Scale Range | +0.1 TO 100.0 PERCENT REVOLUTIONS PER MINUTE SINGLE INDICATOR SINGLE SCALE |
| Diameter | 2.000 INCHES NOMINAL IN |
| Scale Marking Transparency | NONLUMINOUS |
| Contact Quantity | 10 |
| Pointer Type | INDICATING SINGLE POINTER |
| Presentation Type | DIAL |
| Scale Division Quantity | 5 SINGLE INDICATOR SINGLE SCALE |
| Color | WHITE BACKGROUND OVERALL |
| Frequency Rating | 400.0 HERTZ NOMINAL |
| Pointer Finish | NONLUMINOUS SINGLE POINTER |
| Pointer Purpose | PERCENT OF RATED REVOLUTIONS PER MINUTE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| ERU-22/A | 5/1 Secondary reference U.S. Government activity |
| 8DJ215WBA1 | 3/2 Design control — primary reference U.S. Government activity |
| 16VF003-2 | 7/1 Vendor item drawing reference U.S. Government activity |
| 16VF003 TYPE I | 5/1 Secondary reference U.S. Government activity |
NSN 6620-01-129-7247 is a Indicator,electrical Tachometer, classified under FSC 6620, Engine Instruments. Status: active.
3 possible matches (shared part number, not a government interchangeability claim): 6620-01-178-7838, 6620-01-180-5209, 6620-01-270-7772. Verify interchangeability with system specifications before substitution.
Key specifications for 6620-01-129-7247: Mounting Facility Type and Quantity: 1 THREADED BEZEL; Phase: SINGLE; Contact Type: PIN; Scale Marking: NUMERALS. 23 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.
NSN 6620-01-129-7247 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.