The Thermometer,self-Indicating, cataloged under National Stock Number 6685-00-291-1010, 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 14 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6685-00-291-1010 |
| Item Name | Thermometer,self-Indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Socket Overall Length | 4.375 INCHES NOMINAL4.375 INCHES NOMINAL IN |
| Design Type | FLUCTUATINGFLUCTUATING |
| Separable Socket Style | PLAIN SOCKETPLAIN SOCKET |
| Scale Inscription/background Color | BLACK MARKING ON SILVER BACKGROUNDBLACK MARKING ON SILVER BACKGROUND |
| Scale Smallest Increment | 5.0 DEG FAHRENHEIT5.0 DEG FAHRENHEIT |
| Actuating Medium | MERCURYMERCURY |
| Features Provided | LENS MAGNIFYING FRONT AND LENS MAGNIFYING FRONT AND EXPANSION CHAMBEREXPANSION CHAMBER |
| Scale Type | METAL NONMAGNETICMETAL NONMAGNETIC |
| Bulb Tip Outside Diameter | 0.625 INCHES NOMINAL0.625 INCHES NOMINAL IN |
| External Thread Size | 3/4 IN. NPT3/4 IN. NPT IN |
| Internal Thread Size | 1-1/4 IN. - 18 NEF 21-1/4 IN. - 18 NEF 2 IN |
| Material | BRASS OR IRON MALLEABLE OR STEEL OR ALUMINUM ALLOY METER CASE |
| Scale Adjustment Variation | 2 DEGREE2 DEGREE |
| Tip Length | 2.500 INCHES NOMINAL2.500 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| GG-T-321 | 4/1 Identification reference U.S. Government activity |
| MILT15164CLASSA | 5/9 Secondary reference U.S. Government activity |
NSN 6685-00-291-1010 is a Thermometer,self-Indicating, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6685-00-292-1217. Verify interchangeability with system specifications before substitution.
Key specifications for 6685-00-291-1010: Socket Overall Length: 4.375 INCHES NOMINAL4.375 INCHES NOMINAL IN; Design Type: FLUCTUATINGFLUCTUATING; Separable Socket Style: PLAIN SOCKETPLAIN SOCKET; Scale Inscription/background Color: BLACK MARKING ON SILVER BACKGROUNDBLACK MARKING ON SILVER BACKGROUND. 14 specifications are documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC Y). 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.