The Thermostat,flow Control, cataloged under National Stock Number 6685-00-080-5540, is classified within Federal Supply Class 6685 (Pressure, Temperature, and Humidity Measuring and Controlling Instruments) of the Instruments and Laboratory Equipment group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 6685-00-080-5540 |
| Item Name | Thermostat,flow Control |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Spring Operated Pressure Relief | NOT PROVIDED |
| Largest Outside Diameter | 2.547 INCHES NOMINAL IN |
| Mounting Method | FLANGE |
| Operating Temp Rating | 180.0 FAHRENHEIT NOMINAL DEGF |
| Thermostat Type | BELLOWS |
| Usage Design | TYPE CM VALVES |
| Opening Temp Rating | 155.0 FAHRENHEIT NOMINAL DEGF |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| S-101-6A | D/9 Drawing number reference only U.S. Government activity |
| 1125X160 | 3/2 Design control — primary reference U.S. Government activity |
NSN 6685-00-080-5540 is a Thermostat,flow Control, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4730-00-194-9938, 6685-00-489-5377. Verify interchangeability with system specifications before substitution.
Key specifications for 6685-00-080-5540: Overall Height: 3.781 INCHES NOMINAL IN; Spring Operated Pressure Relief: NOT PROVIDED; Largest Outside Diameter: 2.547 INCHES NOMINAL IN; Mounting Method: FLANGE. 7 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.