The Control,temperature,indicating, cataloged under National Stock Number 6685-01-505-6571, 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 Chromalox, Inc. Div Chromalox. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-505-6571 |
| Primary Part Number | 4439-90003 |
| Item Name | Control,temperature,indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Chromalox, Inc. Div Chromalox |
| Status | ACTIVE |
| Maximum Overall Width | 21.000 INCHES IN |
| Phase | THREE |
| Frequency in Hertz | 60.0 |
| Inclosure Type | ENCASED |
| Maximum Overall Length | 24.000 INCHES IN |
| Maximum Overall Height | 8.000 INCHES IN |
| Power Source | EXTERNAL |
| Terminal Location | BACK |
| Terminal Type and Quantity | 3 PIN |
| Maximum Voltage Rating in Volts | 440.0 AC |
| Material | STEEL OR ALUMINUM CASE |
| 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 |
|---|---|
| 4439-90003 PRIMARY | Chromalox, Inc. Div Chromalox (USA) |
| Reference | Meaning |
|---|---|
| D-52153-01 - D-52153-02 REV 3 | D/9 Drawing number reference only Chromalox, Inc. Div Chromalox |
NSN 6685-01-505-6571 is a Control,temperature,indicating, manufactured by Chromalox, Inc. Div Chromalox, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-505-6571 has 1 manufacturer part number on file: 4439-90003 (Chromalox, Inc. Div Chromalox).
Key specifications for 4439-90003: Maximum Overall Width: 21.000 INCHES IN; Phase: THREE; Frequency in Hertz: 60.0; Inclosure Type: ENCASED. 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.