The Thermocouple,immersion, cataloged under National Stock Number 6685-01-017-6445, 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 Semco Instruments, Inc. Dba Harcosemco. Government technical data includes 5 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-017-6445 |
| Primary Part Number | TC 13600-4 |
| Item Name | Thermocouple,immersion |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Semco Instruments, Inc. Dba Harcosemco |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 2 FLANGE |
| Accommodated Wire Awg Size | 18 |
| Immersion Length | 1.168 INCHES NOMINAL IN |
| Unit Type | PROTECTIVE TUBE |
| Operating Temp Range | +1400.0 TO 1800.0 FAHRENHEIT DEGF |
| 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 |
|---|---|
| TC 13600-4 | Semco Instruments, Inc. Dba Harcosemco (USA) |
| 969164-4 | Service & Sales Inc (USA) |
| Reference | Meaning |
|---|---|
| 1522-100 | D/9 Drawing number reference only Associated Components Manufacturing, Inc |
| 969164-4 | 3/2 Design control — primary reference U.S. Government activity |
| 1522-100-4 | 5/9 Secondary reference Associated Components Manufacturing, Inc |
NSN 6685-01-017-6445 is a Thermocouple,immersion, manufactured by Semco Instruments, Inc. Dba Harcosemco, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-017-6445 has 2 manufacturer part numbers on file: TC 13600-4 (Semco Instruments, Inc. Dba Harcosemco), 969164-4 (Service & Sales Inc).
2 possible matches (shared part number, not a government interchangeability claim): 3040-01-493-1709, 3040-01-493-1725. Verify interchangeability with system specifications before substitution.
Key specifications for TC 13600-4: Mounting Facility Type and Quantity: 2 FLANGE; Overall Length: 44.500 INCHES MINIMUM AND 45.500 INCHES MAXIMUM IN; Accommodated Wire Awg Size: 18; Immersion Length: 1.168 INCHES NOMINAL IN. 5 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.