The Thermostat,temperat, cataloged under National Stock Number 6685-00-377-8991, 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 Kysor Industrial Corp. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Thermostat,temperat |
| FSC / FSG | 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments (FSG 66) |
| Manufacturers | Fwd Seagrave Holdings Lp (CAGE 23382); Kysor Industrial Corp (CAGE 75418); Dresser Industries Inc Leroi Div (CAGE 35301) |
| Parameter | Value |
|---|---|
| NSN | 6685-00-377-8991 |
| Primary Part Number | C550-80 |
| Item Name | Thermostat,temperat |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Kysor Industrial Corp |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Part Number | Manufacturer |
|---|---|
| 43TC5500-80 | Fwd Seagrave Holdings Lp (USA) |
| C550-80 PRIMARY | Kysor Industrial Corp (USA) |
| 116-190 PRIMARY | Dresser Industries Inc Leroi Div (USA) |
NSN 6685-00-377-8991 is a Thermostat,temperat, manufactured by Kysor Industrial Corp, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-00-377-8991 has 3 manufacturer part numbers on file: 43TC5500-80 (Fwd Seagrave Holdings Lp), C550-80 (Kysor Industrial Corp), 116-190 (Dresser Industries Inc Leroi Div).
1 possible match (shared part number, not a government interchangeability claim): 6105-01-137-4470. Verify interchangeability with system specifications before substitution.
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.