The Gage,pressure,dial Indicating, cataloged under National Stock Number 6685-01-623-9900, 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 23 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-623-9900 |
| Item Name | Gage,pressure,dial Indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Mounting Hole Quantity | 3 |
| Scale Name | PRESSURE |
| Actuation Type | BOURDON TUBE |
| Scale Inscription/background Color | WHITE BACKGROUND DIAL WITH BLACK GRADIATIONS AND MARKING |
| Scale Smallest Increment | 0.1 HECTOPASCAL |
| Connection Type | EXTERNAL |
| Scale Range | +0.0 TO 100.0 HECTOPASCAL |
| Mounting Hole Diameter | 0.250 INCHES NOMINAL IN |
| Pointer Type | INDICATING |
| Adjustability | ADJUSTABLE |
| Specification/standard Data | 81349-MIL-G-18997 GOVERNMENT SPECIFICATION |
| Scale Type | DIAL |
| Connector Type Vent | NOT PROVIDED |
| Dial Size | 41/2 INCH DIAMETER IN |
| Graduation Unit | 10.0 HECTOPASCAL |
| Connection Location | BACK |
| Pointer Color | BLACK |
| Surface Treatment | CHROMIUM CASE |
| Unable to Decode | UNABLE TO DECODE |
| Material | NICKEL ALLOY ACTUATING ELEMENT |
| Material | ALUMINUM CASE |
| Connection Quantity | 1 |
| Connection Size | 7/16-20 UNF 2A FLARELESS BITE TYPE WITH FERRULE AND NUT A |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| EA243PYFEWBO | 5/1 Secondary reference Mmc Metrology Lab, Inc. Dba Mmc Metrology Lab Inc |
| MIL-G-18997 | 4/1 Identification reference U.S. Government activity |
| SG4MC10KPWCCNA | 2/2 Government specification standardization U.S. Government activity |
| 504-8200941 ITEM NO 21 | 5/1 Secondary reference Naval Sea Systems Command |
| EA243PYFEWB0 | 5/1 Secondary reference Ashcroft Inc Dba Heise |
NSN 6685-01-623-9900 is a Gage,pressure,dial 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): 6685-01-688-3260. Verify interchangeability with system specifications before substitution.
Key specifications for 6685-01-623-9900: Mounting Hole Quantity: 3; Scale Name: PRESSURE; Actuation Type: BOURDON TUBE; Scale Inscription/background Color: WHITE BACKGROUND DIAL WITH BLACK GRADIATIONS AND MARKING. 23 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.