The Gage,vacuum,indicating, cataloged under National Stock Number 6685-01-105-6841, 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 Bellofram Corporation. Government technical data includes 26 specifications, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-105-6841 |
| Primary Part Number | E3405 |
| Item Name | Gage,vacuum,indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Bellofram Corporation |
| Status | ACTIVE |
| Mounting Hole Quantity | 3 |
| Scale Accuracy | PORM 0.5 PCT FULL RANGE |
| Scale Name | VACUUM |
| Overall Diameter | 6.312 INCHES NOMINAL IN |
| Actuation Type | BOURDON TUBE |
| Mounting Method | FLUSH PANEL |
| Scale Inscription/background Color | BLACK MARKINGS ON WHITE BACKGROUND |
| Scale Smallest Increment | 0.25 INCHES OF MERCURY (INHG) IN |
| Connection Type | EXTERNAL |
| Scale Range | +0.0 TO 30.0 INCHES OF MERCURY IN |
| Mounting Hole Diameter | 0.219 INCHES NOMINAL IN |
| Pointer Type | INDICATING |
| Adjustability | ADJUSTABLE |
| Scale Type | SINGLE |
| Connector Type Vent | NOT PROVIDED |
| Dial Size | 4-1/2 IN. DIA IN |
| Graduation Unit | 3.0 INCHES OF MERCURY IN |
| Bolt Circle Diameter | 5.688 INCHES NOMINAL IN |
| Connection Location | LEFT SIDE TOP |
| Pointer Color | BLACK |
| Surface Treatment | PAINT CASE |
| Material | PLASTIC ACRYLIC PROTECTIVE CRYSTAL |
| Material | STEEL CORROSION RESISTING ACTUATING ELEMENT |
| Material | STEEL ALLOY CASE |
| Connection Quantity | 1 |
| Connection Size | 0.250 IN. NPT DIA IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
NSN 6685-01-105-6841 is a Gage,vacuum,indicating, manufactured by Bellofram Corporation, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-105-6841 has 2 manufacturer part numbers on file: E3405 (Bellofram Corporation), 66885-520 (Flightsafety International Inc).
1 possible match (shared part number, not a government interchangeability claim): 6515-01-482-7987. Verify interchangeability with system specifications before substitution.
Key specifications for E3405: Mounting Hole Quantity: 3; Scale Accuracy: PORM 0.5 PCT FULL RANGE; Scale Name: VACUUM; Overall Diameter: 6.312 INCHES NOMINAL IN. 26 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.