The Thermometer,self-Indicating, cataloged under National Stock Number 6685-01-554-3900, 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 Ashcroft Inc Dba Heise. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 6685-01-554-3900 |
| Primary Part Number | 41G-SY-00-FF-A0-Y |
| Item Name | Thermometer,self-Indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Scale Type | DIAL |
| 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 |
|---|---|
| 41G-SY-00-FF-A0-Y PRIMARY | Ashcroft Inc Dba Heise (USA) |
| PA12652458 | Fairbanks Morse, Llc (USA) |
| Reference | Meaning |
|---|---|
| PA12652458 | 5/9 Secondary reference U.S. Government activity |
| 41G-SY-00-FF-A0-Y | 5/1 Secondary reference Ashcroft Inc Dba Heise |
NSN 6685-01-554-3900 is a Thermometer,self-Indicating, manufactured by Ashcroft Inc Dba Heise, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-554-3900 has 2 manufacturer part numbers on file: 41G-SY-00-FF-A0-Y (Ashcroft Inc Dba Heise), PA12652458 (Fairbanks Morse, Llc).
Key specifications for 41G-SY-00-FF-A0-Y: Scale Type: DIAL; Special Features: THERMOMETER HAS 4.5 INCH DIAMETER DIAL, AND 100 FOOT TUBE IN; Part Name Assigned by Controlling Agency: (INAVY) THERMOMETER, GUAGE; End Item Identification: DIESEL ENGINE MN PRPL; 16PA6B-STC-LCS. 1 specification is 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.