The Thermocouple,immersion, cataloged under National Stock Number 6685-01-491-5501, 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 Rosemount Aerospace Inc. Dba Rosemount Aerospace Division Div Utas. Government technical data includes 10 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-491-5501 |
| Primary Part Number | 123DP1 |
| Item Name | Thermocouple,immersion |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Rosemount Aerospace Inc. Dba Rosemount Aerospace Division Div Utas |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 1 EXTERNAL STRAIGHT THREAD CONNECTION |
| Relationship to Similar Equipment | NOT INTERCHANGEABLE WITH OTHERS OF THIS PART NUMBER SERIES |
| Reference Data and Literature | BOEING DRAWING |
| Mounting Facility Screw Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Mounting Thread Quantity | 20 PER INCH |
| Immersion Length | 3.550 INCHES NOMINAL IN |
| Mounting Facility Nominal Screw Thread Diameter | 0.437 INCHES IN |
| Reliability Indicator | ESTABLISHED |
| Operating Temp Range | -71.0 TO 185.0 FAHRENHEIT DEGF |
| Terminal Type and Quantity | 1 CONNECTOR, RECEPTACLE |
| 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 |
|---|---|
| 525-11433-1 | Northrop Grumman Systems Corporation (USA) |
| 123DP1 PRIMARY | Rosemount Aerospace Inc. Dba Rosemount Aerospace Division Div Utas (USA) |
NSN 6685-01-491-5501 is a Thermocouple,immersion, manufactured by Rosemount Aerospace Inc. Dba Rosemount Aerospace Division Div Utas, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-491-5501 has 2 manufacturer part numbers on file: 525-11433-1 (Northrop Grumman Systems Corporation), 123DP1 (Rosemount Aerospace Inc. Dba Rosemount Aerospace Division Div Utas).
Key specifications for 123DP1: Mounting Facility Type and Quantity: 1 EXTERNAL STRAIGHT THREAD CONNECTION; Relationship to Similar Equipment: NOT INTERCHANGEABLE WITH OTHERS OF THIS PART NUMBER SERIES; Reference Data and Literature: BOEING DRAWING; Mounting Facility Screw Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF). 10 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.