The Thermowell, cataloged under National Stock Number 6685-01-149-2778, 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 Moeller Instrument Company, Inc. Dba Moeller Instrument Co. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-149-2778 |
| Primary Part Number | 2M-D |
| Item Name | Thermowell |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Moeller Instrument Company, Inc. Dba Moeller Instrument Co |
| Status | ACTIVE |
| Bulb Tip Length | 2.000 INCHES NOMINAL IN |
| 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 |
|---|---|
| W4C4 | Ashcroft Inc Dba Heise (USA) |
| 2M-D PRIMARY | Moeller Instrument Company, Inc. Dba Moeller Instrument Co (USA) |
| Reference | Meaning |
|---|---|
| W4C4 | 5/9 Secondary reference Weksler Glass Thermometer Corp |
| RI-017-01 | 5/9 Secondary reference Rhythm Industries Inc |
| 6685PL0804330 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 6685-01-149-2778 is a Thermowell, manufactured by Moeller Instrument Company, Inc. Dba Moeller Instrument Co, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-149-2778 has 2 manufacturer part numbers on file: W4C4 (Ashcroft Inc Dba Heise), 2M-D (Moeller Instrument Company, Inc. Dba Moeller Instrument Co).
Key specifications for 2M-D: Bulb Tip Length: 2.000 INCHES NOMINAL IN. 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.