The Thermocouple,immersion, cataloged under National Stock Number 6685-00-445-7675, 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 Honeywell Inc Process Control Div. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 4 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 | 6685-00-445-7675 |
| Primary Part Number | 3D33B4-30-3 |
| Item Name | Thermocouple,immersion |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Honeywell Inc Process Control Div |
| Status | ACTIVE |
| Mounting Facility Type and Quantity | 1 EXTERNAL THREAD |
| Mounting Facility Screw Thread Series Designator | NPT |
| Accommodated Wire Awg Size | 14 |
| Mounting Thread Quantity | 14 PER INCH |
| Immersion Length | 3.500 INCHES NOMINAL IN |
| Mounting Facility Nominal Screw Thread Diameter | 0.500 INCHES IN |
| Unit Type | PROTECTIVE TUBE |
| Operating Temp Range | +0.0 TO 1200.0 FAHRENHEIT DEGF |
| Material | CERAMIC OUTER JACKET INSULATION/SHEATHING |
| Material | CERAMIC INDIVIDUAL WIRE INSULATION |
| Terminal Type and Quantity | 2 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 |
| Part Number | Manufacturer |
|---|---|
| 79289-4 | Honeywell Inc Process Control Div (USA) |
| 18424-4 | Honeywell Inc Process Control Div (USA) |
| 3D33B4-30-3 PRIMARY | Honeywell Inc Process Control Div (USA) |
| 18424-4 | Hatch & Kirk, Inc. (USA) |
NSN 6685-00-445-7675 is a Thermocouple,immersion, manufactured by Honeywell Inc Process Control Div, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-00-445-7675 has 4 manufacturer part numbers on file: 79289-4 (Honeywell Inc Process Control Div), 18424-4 (Honeywell Inc Process Control Div), 3D33B4-30-3 (Honeywell Inc Process Control Div), 18424-4 (Hatch & Kirk, Inc.).
1 possible match (shared part number, not a government interchangeability claim): 5330-01-150-3975. Verify interchangeability with system specifications before substitution.
Key specifications for 3D33B4-30-3: Mounting Facility Type and Quantity: 1 EXTERNAL THREAD; Mounting Facility Screw Thread Series Designator: NPT; Overall Length: 9.438 INCHES NOMINAL IN; Accommodated Wire Awg Size: 14. 11 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.