The Thermocouple,immersion, cataloged under National Stock Number 6685-01-258-0349, 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 6 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-258-0349 |
| Item Name | Thermocouple,immersion |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Accommodated Wire Awg Size | 20 |
| Immersion Length | 1.250 INCHES NOMINAL IN |
| Unit Type | PROTECTIVE TUBE |
| Operating Temp Range | +32.0 TO 1400.0 FAHRENHEIT DEGF |
| Material | STEEL COMP 304 OUTER JACKET INSULATION/SHEATHING |
| Terminal Type and Quantity | 1 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 |
|---|---|
| JJ316G-304-SS1/4-1 1/40L | 3/2 Design control — primary reference U.S. Government activity |
NSN 6685-01-258-0349 is a Thermocouple,immersion, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6685-01-268-6651. Verify interchangeability with system specifications before substitution.
Key specifications for 6685-01-258-0349: Accommodated Wire Awg Size: 20; Immersion Length: 1.250 INCHES NOMINAL IN; Unit Type: PROTECTIVE TUBE; Operating Temp Range: +32.0 TO 1400.0 FAHRENHEIT DEGF. 6 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.