The Indicator,electrical Tachometer, cataloged under National Stock Number 6620-01-321-6819, is classified within Federal Supply Class 6620 (Engine Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems. Government technical data includes 23 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6620-01-321-6819 |
| Primary Part Number | 158176-1 |
| Item Name | Indicator,electrical Tachometer |
| FSC / FSG | 6620 / 66 — Engine Instruments |
| Manufacturer | Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems |
| 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 110.0 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 |
| Part Number | Manufacturer |
|---|---|
| 158176-1 PRIMARY | Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems (USA) |
| Reference | Meaning |
|---|---|
| 5076-300 | 7/2 Vendor item drawing reference Horizon Aerospace Llc Dba Transicoil |
| 16VF003 TYPE II | 5/1 Secondary reference U.S. Government activity |
| 6620PL0737322 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 16VF003-31 | 7/2 Vendor item drawing reference U.S. Government activity |
NSN 6620-01-321-6819 is a Indicator,electrical Tachometer, manufactured by Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems, classified under FSC 6620, Engine Instruments. Status: active.
NSN 6620-01-321-6819 has 1 manufacturer part number on file: 158176-1 (Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems).
Key specifications for 158176-1: 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 6620-01-321-6819 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.