The Thermostat,flow Control, cataloged under National Stock Number 6685-01-062-2151, 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 Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 11 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-062-2151 |
| Primary Part Number | 751723 |
| Item Name | Thermostat,flow Control |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Flow Control Device | BY-PASS POPPET |
| Spring Operated Pressure Relief | NOT PROVIDED |
| Largest Outside Diameter | 0.401 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN |
| Mounting Method | THREADED |
| Valve Travel Distance | 0.575 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND |
| Operating Temp Rating | 300.0 FAHRENHEIT MAXIMUM DEGF |
| Thermostat Type | WAX PELLET |
| Usage Design | FUEL SYSTEM,AIRCRAFT |
| Opening Temp Rating | 40.0 FAHRENHEIT NOMINAL DEGF |
| Thread Size and Series/type Designator | 0.500-20 UNF |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 751723 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| Reference | Meaning |
|---|---|
| 751723 | 5/9 Secondary reference Actronics Incorporated Dba Actronics Inc |
NSN 6685-01-062-2151 is a Thermostat,flow Control, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-062-2151 has 1 manufacturer part number on file: 751723 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney).
1 possible match (shared part number, not a government interchangeability claim): 6750-01-427-6312. Verify interchangeability with system specifications before substitution.
Key specifications for 751723: Flow Control Device: BY-PASS POPPET; Spring Operated Pressure Relief: NOT PROVIDED; Largest Outside Diameter: 0.401 INCHES MINIMUM AND 0.411 INCHES MAXIMUM IN; Mounting Method: THREADED. 11 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.
NSN 6685-01-062-2151 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.