The Thermostat Controlling, cataloged under National Stock Number 6685-01-100-6404, 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 Residential Div. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 6685-01-100-6404 |
| Primary Part Number | T991A1426 |
| Item Name | Thermostat Controlling |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Honeywell Inc Residential Div |
| Status | ACTIVE |
| General Characteristics Item Description | 1,UNIT QTY,EA.,SENSING BULB HAS A BOILER PLUG WITH 1/2 IN. - 14 IN. NPT THREAD,0 TO 100 DEGREE F. IN |
| 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 |
|---|---|
| T991A1426 PRIMARY | Honeywell Inc Residential Div (USA) |
| Reference | Meaning |
|---|---|
| T991A | 5/9 Secondary reference Honeywell Inc Residential Div |
NSN 6685-01-100-6404 is a Thermostat Controlling, manufactured by Honeywell Inc Residential Div, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-100-6404 has 1 manufacturer part number on file: T991A1426 (Honeywell Inc Residential Div).
Key specifications for T991A1426: General Characteristics Item Description: 1,UNIT QTY,EA.,SENSING BULB HAS A BOILER PLUG WITH 1/2 IN. - 14 IN. NPT THREAD,0 TO 100 DEGREE F. IN. 1 specification is 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.