The Gage,compound Pressure-Vacuum,di, cataloged under National Stock Number 6685-00-901-3740, 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 28 specifications, cited from the U.S. Government catalog. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-00-901-3740 |
| Item Name | Gage,compound Pressure-Vacuum,di |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Status | ACTIVE |
| Mounting Hole Quantity | 3 |
| Scale Accuracy | 1 PCT ENTIRE RANGE |
| Scale Name | PRESSURE-VACUUM |
| Overall Diameter | 6.312 INCHES NOMINAL IN |
| Actuation Type | BOURDON TUBE |
| Mounting Method | FLUSH |
| Scale Inscription/background Color | BLACK FIGURES,RED BAND 10 TO 30 IN. HG AND 150 TO 300 PSI,WHITE BACKGROUND IN |
| Scale Smallest Increment | 5.0 INCHES OF MERCURY (INHG) AND 2.0 POUNDS PER SQUARE INCH (PSI) LBS |
| Connection Type | INTERNAL |
| Scale Range | +0.0 TO 30.0 INCHES OF MERCURY AND +0.0 TO 300.0 POUNDS PRESSURE PER SQUARE INCH LBS |
| Mounting Hole Diameter | 0.219 INCHES NOMINAL IN |
| Scale Name for Which Pointer Is Designed | PRESSURE-VACUUM |
| Pointer Type | INDICATING |
| Adjustability | ADJUSTABLE |
| Scale Type | SINGLE |
| Connector Type Vent | NOT PROVIDED |
| Dial Size | 4-1/2 IN. DIA IN |
| Graduation Unit | 5.0 INCHES OF MERCURY AND 30.0 POUNDS PER SQUARE INCH LBS |
| Bolt Circle Diameter | 5.688 INCHES NOMINAL IN |
| Connection Location | LOWER BACK |
| Pointer Color | BLACK |
| Surface Treatment | PAINT |
| Material | STEEL CASE |
| Material | STEEL CORROSION RESISTING ACTUATING ELEMENT |
| Material | GLASS PLATE OR PLASTIC PROTECTIVE CRYSTAL |
| Connection Quantity | 1 |
| Bezel Type | HINGE |
| Connection Size | 0.250 IN. TUBE IN |
| 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 |
|---|---|
| 309-015 ST.STEEL, 1/4 NPT.CONN. | 3/2 Design control — primary reference U.S. Government activity |
| 1-ZMF-38077-ASA-001 | 5/9 Secondary reference Desco Corp Marsh Bellofram Div |
| 309-015 | 5/9 Secondary reference U.S. Government activity |
| 1-XFF-38077-ASA-001 | 5/9 Secondary reference Robin Aerospace Products Ltd |
| XH101-56A | 5/9 Secondary reference Desco Corp Marsh Bellofram Div |
NSN 6685-00-901-3740 is a Gage,compound Pressure-Vacuum,di, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 5930-01-095-9823, 5905-01-216-6591. Verify interchangeability with system specifications before substitution.
Key specifications for 6685-00-901-3740: Mounting Hole Quantity: 3; Scale Accuracy: 1 PCT ENTIRE RANGE; Scale Name: PRESSURE-VACUUM; Overall Diameter: 6.312 INCHES NOMINAL IN. 28 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.