The Thermocouple,immersion, cataloged under National Stock Number 6685-00-641-6111, 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 7 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-00-641-6111 |
| Item Name | Thermocouple,immersion |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Mounting Facility Screw Thread Series Designator | NPT |
| Accommodated Wire Awg Size | 26 |
| Mounting Thread Quantity | 27 PER INCH |
| Immersion Length | 0.250 INCHES MINIMUM AND 1.250 INCHES MAXIMUM IN |
| Mounting Facility Nominal Screw Thread Diameter | 0.125 INCHES IN |
| Unit Type | PROTECTIVE TUBE |
| Operating Temp Range | -50.0 TO 400.0 CELSIUS DEGC |
| 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 |
|---|---|
| 650158 | 3/2 Design control — primary reference U.S. Government activity |
| 10847-3 | 3/2 Design control — primary reference U.S. Government activity |
| 810911 | 5/9 Secondary reference Meggitt (new Hampshire), Inc |
NSN 6685-00-641-6111 is a Thermocouple,immersion, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5945-01-377-9927, 5345-01-545-8972. Verify interchangeability with system specifications before substitution.
Key specifications for 6685-00-641-6111: Mounting Facility Screw Thread Series Designator: NPT; Overall Length: 19.500 INCHES MINIMUM AND 20.500 INCHES MAXIMUM IN; Accommodated Wire Awg Size: 26; Mounting Thread Quantity: 27 PER INCH. 7 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.