The Thermostat,flow Control, cataloged under National Stock Number 6685-01-667-6656, 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 Aerobase Group Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-667-6656 |
| Primary Part Number | TC-4111-020 |
| Item Name | Thermostat,flow Control |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Aerobase Group Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| TC-4111-020 | Aerobase Group Inc (USA) |
| Reference | Meaning |
|---|---|
| TC-4111-020 | 3/9 Design control — primary reference Siebe North Inc North Safety Equipment Div |
NSN 6685-01-667-6656 is a Thermostat,flow Control, manufactured by Aerobase Group Inc, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-667-6656 has 1 manufacturer part number on file: TC-4111-020 (Aerobase Group Inc).
1 possible match (shared part number, not a government interchangeability claim): 5930-01-668-8966. Verify interchangeability with system specifications before substitution.
Key specifications for TC-4111-020: Special Features: SINGLE STAGE SINGLE BULB SETPOINT ADJUSTMENT RANGE -40 TO 120 F SAFE BULB TEMPERATURE RANGE -40 TO 170 F CONNECTIONS CODED SCREW TERMINALS COVER: ALLMETAL WITH 1/2 TO 3/4 CONDUIT OPENINGS NEMA TYPE 1 INDOOR ONLY CASE 4-5/8 HIGH X 2-1/4; Part Name Assigned by Controlling Agency: THERMOSTAT. 0 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.