The Thermostat,flow Control, cataloged under National Stock Number 6685-01-502-1891, 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 3 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-502-1891 |
| 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 |
| Thermostat Type | ANY ACCEPTABLE |
| Usage Design | TEMP CONTROL |
| 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 |
|---|---|
| 284381-0004 ITEM 22 | D/9 Drawing number reference only U.S. Government activity |
| 197527 | 3/2 Design control — primary reference U.S. Government activity |
NSN 6685-01-502-1891 is a Thermostat,flow Control, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
Key specifications for 6685-01-502-1891: Spring Operated Pressure Relief: NOT PROVIDED; Thermostat Type: ANY ACCEPTABLE; End Item Identification: VALVE, FLOW RATE; Usage Design: TEMP CONTROL. 3 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.