The Thermostat,flow Control, cataloged under National Stock Number 6685-00-752-1868, 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 U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 10 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through both NSN and commercial part number lookups. 8 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-00-752-1868 |
| Primary Part Number | 7521868 |
| Item Name | Thermostat,flow Control |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Flow Control Device | BY-PASS |
| FSC Application Data | RADIATOR,COOLING SYSTEM,ENGINE,NON AIRCRAFT |
| Spring Operated Pressure Relief | NOT PROVIDED |
| Largest Outside Diameter | 2.625 INCHES NOMINAL IN |
| Mounting Method | FLANGE |
| Valve Travel Distance | 0.290 INCHES MINIMUM AND 0.343 INCHES MAXIMUM IN |
| Operating Temp Rating | 183.0 FAHRENHEIT NOMINAL DEGF |
| Thermostat Type | BELLOWS |
| Usage Design | TO COOL ENGINE OPERATION |
| Opening Temp Rating | 160.0 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 |
| Part Number | Manufacturer |
|---|---|
| 7521868 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 392A5 | 5/9 Secondary reference Diamond Reo Truck Co |
| 3156261M0DT261 | 5/9 Secondary reference General Motors Corp Harrison Radiator Div |
| 3156261M0DT261 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
| 3156261M0DT261 | 5/9 Secondary reference General Motors Corp |
| 3139592 | 5/9 Secondary reference General Motors Corp |
| 3125363 | 5/9 Secondary reference General Motors Corp |
| 3139592 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
| 3125363 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 6685-00-752-1868 is a Thermostat,flow Control, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-00-752-1868 has 1 manufacturer part number on file: 7521868 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 7521868: Flow Control Device: BY-PASS; Overall Height: 1.780 INCHES NOMINAL IN; FSC Application Data: RADIATOR,COOLING SYSTEM,ENGINE,NON AIRCRAFT; Spring Operated Pressure Relief: NOT PROVIDED. 10 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.