The Indicator,temperature,electrical, cataloged under National Stock Number 6685-01-129-3901, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. The manufacturer of record is Ontic Engineering and Manufacturing, Inc.. Government technical data includes 2 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 6685-01-129-3901 |
| Primary Part Number | 147B51-1 |
| Item Name | Indicator,temperature,electrical |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Ontic Engineering and Manufacturing, Inc. |
| Status | ACTIVE |
| Length | 3.470 INCHES NOMINAL IN |
| Diameter | 2.000 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 147B51-1 PRIMARY | Ontic Engineering and Manufacturing, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 147B51 | 5/9 Secondary reference Horizon Aerospace Llc Dba Magnetics Division |
| 147B51-1 | 5/9 Secondary reference Horizon Aerospace Llc Dba Magnetics Division |
| 147B51-1 | 5/9 Secondary reference Ultra Maritime Llc |
| 147B51-1 | 5/9 Secondary reference Undersea Sensor Systems Inc Div Ultra Sonobuoy Systems |
NSN 6685-01-129-3901 is a Indicator,temperature,electrical, manufactured by Ontic Engineering and Manufacturing, Inc., classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-129-3901 has 1 manufacturer part number on file: 147B51-1 (Ontic Engineering and Manufacturing, Inc.).
Key specifications for 147B51-1: Length: 3.470 INCHES NOMINAL IN; Diameter: 2.000 INCHES NOMINAL IN. 2 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.