The Thermostat,flow Control, cataloged under National Stock Number 6685-01-591-5114, 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 The W.w. Williams Company, Llc Dba the W.w. Williams Co, Llc. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 6685-01-591-5114 |
| Primary Part Number | 25-39667-00SV |
| Item Name | Thermostat,flow Control |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | The W.w. Williams Company, Llc Dba the W.w. Williams Co, Llc |
| Status | ACTIVE |
| Spring Operated Pressure Relief | PROVIDED |
| Largest Outside Diameter | 1.500 INCHES NOMINAL IN |
| Thermostat Type | COIL SPRING BIMETALLIC |
| Usage Design | CONTROLS COOLANT ON DIESEL ENGINE |
| 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 |
|---|---|
| 25-39667-00SV PRIMARY | The W.w. Williams Company, Llc Dba the W.w. Williams Co, Llc (USA) |
| Reference | Meaning |
|---|---|
| 25-34309-01 | 5/9 Secondary reference The W.w. Williams Company, Llc Dba the W.w. Williams Co, Llc |
NSN 6685-01-591-5114 is a Thermostat,flow Control, manufactured by The W.w. Williams Company, Llc Dba the W.w. Williams Co, Llc, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-591-5114 has 1 manufacturer part number on file: 25-39667-00SV (The W.w. Williams Company, Llc Dba the W.w. Williams Co, Llc).
Key specifications for 25-39667-00SV: Overall Height: 1.870 INCHES NOMINAL IN; Spring Operated Pressure Relief: PROVIDED; Largest Outside Diameter: 1.500 INCHES NOMINAL IN; Thermostat Type: COIL SPRING BIMETALLIC. 4 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.