The Thermocouple,immersion, cataloged under National Stock Number 6685-00-409-1053, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-00-409-1053 |
| Item Name | Thermocouple,immersion |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 1 EXTERNAL THREAD |
| Mounting Facility Screw Thread Series Designator | NPT |
| Material Document and Classification | LTCT21885-01,91547 MFR REF ALL MATERIAL RESPONSES OUTER JACKET INSULATION/SHEATHING |
| Material Document and Classification | LTCT21885-01,91547 MFR REF ALL MATERIAL RESPONSES PROTECTIVE TUBE |
| Accommodated Wire Awg Size | 18 |
| Mounting Thread Quantity | 27 PER INCH |
| Immersion Length | 0.188 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Mounting Facility Nominal Screw Thread Diameter | 0.125 INCHES IN |
| Unit Type | PROTECTIVE TUBE |
| Operating Temp Range | +0.0 TO 1000.0 FAHRENHEIT DEGF |
| Material | FIBERGLASS OUTER JACKET INSULATION/SHEATHING |
| Material | FIBERGLASS PROTECTIVE TUBE |
| Terminal Type and Quantity | 1 CONNECTOR, PLUG |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| LTCT21885-01 | 5/9 Secondary reference U.S. Government activity |
| TF40120-2 | 3/2 Design control — primary reference U.S. Government activity |
| LTCT21885-01 | 5/9 Secondary reference U.S. Government activity |
NSN 6685-00-409-1053 is a Thermocouple,immersion, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
Key specifications for 6685-00-409-1053: Mounting Facility Type and Quantity: 1 EXTERNAL THREAD; Mounting Facility Screw Thread Series Designator: NPT; Material Document and Classification: LTCT21885-01,91547 MFR REF ALL MATERIAL RESPONSES OUTER JACKET INSULATION/SHEATHING; Material Document and Classification: LTCT21885-01,91547 MFR REF ALL MATERIAL RESPONSES PROTECTIVE TUBE. 13 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.