The Thermocouple,immersion, cataloged under National Stock Number 6685-01-477-3873, 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 Harcosemco Llc 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. 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 | 6685-01-477-3873 |
| Primary Part Number | 23504-001 |
| Item Name | Thermocouple,immersion |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Harcosemco Llc Dba Harcosemco |
| Status | ACTIVE |
| Mounting Facility Screw Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Mounting Thread Quantity | 18 PER INCH |
| Immersion Length | 1.220 INCHES MINIMUM AND 1.260 INCHES MAXIMUM IN |
| Mounting Facility Nominal Screw Thread Diameter | 0.562 INCHES IN |
| Material | NICKEL ALLOY OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
NSN 6685-01-477-3873 is a Thermocouple,immersion, manufactured by Harcosemco Llc Dba Harcosemco, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-477-3873 has 2 manufacturer part numbers on file: 1B7555 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 23504-001 (Harcosemco Llc Dba Harcosemco).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-670-1699. Verify interchangeability with system specifications before substitution.
Key specifications for 23504-001: Mounting Facility Screw Thread Series Designator: UNIFIED NATIONAL JOINT FINE (UNJF); Overall Length: 4.939 INCHES MINIMUM AND 5.029 INCHES MAXIMUM IN; Mounting Thread Quantity: 18 PER INCH; Immersion Length: 1.220 INCHES MINIMUM AND 1.260 INCHES MAXIMUM 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.