The Thermostat,flow Control, cataloged under National Stock Number 6685-00-649-8465, 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 Brinkley Technology Group Llc Dba Hercules Manufacturing. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-00-649-8465 |
| Primary Part Number | 255740B |
| Item Name | Thermostat,flow Control |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Brinkley Technology Group Llc Dba Hercules Manufacturing |
| Status | ACTIVE |
| Flow Control Device | BY-PASS |
| FSC Application Data | ENGINE,DIESEL |
| Spring Operated Pressure Relief | NOT PROVIDED |
| Largest Outside Diameter | 2.552 INCHES NOMINAL IN |
| Mounting Method | FLANGE |
| Valve Travel Distance | 0.312 INCHES NOMINAL IN |
| Operating Temp Rating | 206.0 FAHRENHEIT NOMINAL DEGF |
| Thermostat Type | BELLOWS |
| Usage Design | REGULATE AND COOL WATER |
| Opening Temp Rating | 180.0 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 |
|---|---|
| 559D1-1061 | Kurz & Root Generator Company, Llc (USA) |
| 739E1 | Linde Material Handling North America Corporation (USA) |
| 255740B PRIMARY | Brinkley Technology Group Llc Dba Hercules Manufacturing (USA) |
| Reference | Meaning |
|---|---|
| 739E1 | 5/9 Secondary reference Linde Lift Truck Corp. |
| 255740B | 5/9 Secondary reference Hercules Engine Co Inc |
NSN 6685-00-649-8465 is a Thermostat,flow Control, manufactured by Brinkley Technology Group Llc Dba Hercules Manufacturing, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-00-649-8465 has 3 manufacturer part numbers on file: 559D1-1061 (Kurz & Root Generator Company, Llc), 739E1 (Linde Material Handling North America Corporation), 255740B (Brinkley Technology Group Llc Dba Hercules Manufacturing).
Key specifications for 255740B: Flow Control Device: BY-PASS; Overall Height: 2.317 INCHES NOMINAL IN; FSC Application Data: ENGINE,DIESEL; 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.