The Gage,compound Pressure-Vacuum,di, cataloged under National Stock Number 6685-01-037-9178, 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 Ashcroft Inc Dba Heise. Government technical data includes 28 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-037-9178 |
| Primary Part Number | 25-1009AW-02B-XFF-30/0/300 PSI |
| Item Name | Gage,compound Pressure-Vacuum,di |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Ashcroft Inc Dba Heise |
| Status | ACTIVE |
| Mounting Hole Quantity | 3 |
| Scale Accuracy | 1 PCT ENTIRE RANGE |
| Scale Name | PRESSURE-VACUUM |
| Overall Diameter | 3.688 INCHES NOMINAL IN |
| Actuation Type | BOURDON TUBE |
| Mounting Method | FLUSH |
| Scale Inscription/background Color | BLACK MARKINGS ON WHITE BACKGROUND |
| Scale Smallest Increment | 5.0 INCHES OF MERCURY (INHG) AND 5.0 POUNDS PER SQUARE INCH (PSI) LBS |
| Connection Type | EXTERNAL |
| 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 | 0.160 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 | 2-1/2 IN. DIA IN |
| Graduation Unit | 30.0 INCHES OF MERCURY AND 25.0 POUNDS PER SQUARE INCH LBS |
| Bolt Circle Diameter | 3.130 INCHES NOMINAL IN |
| Connection Location | BACK |
| Pointer Color | BLACK |
| Surface Treatment | POLISHED CASE |
| Material | GLASS PROTECTIVE CRYSTAL |
| Material | STEEL CORROSION RESISTING CASE |
| Material | BRONZE ACTUATING ELEMENT |
| Connection Quantity | 1 |
| Bezel Type | BAYONET |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 25-1009AW-02B-XFF-30/0/300 PSI PRIMARY | Ashcroft Inc Dba Heise (USA) |
| Reference | Meaning |
|---|---|
| 1009ACXFF-300PSIAND30IN | 5/1 Secondary reference Ashcroft Inc Dba Heise |
| 55599 | 5/9 Secondary reference U.S. Government activity |
| 25-1009AC-02B-XFF-300PSI30HG-OS | 5/9 Secondary reference Ashcroft Inc Dba Heise |
| 1009ACXFF,300PSI | C/1 Advisory reference — outside the item-of-supply concept Ashcroft Inc Dba Heise |
NSN 6685-01-037-9178 is a Gage,compound Pressure-Vacuum,di, manufactured by Ashcroft Inc Dba Heise, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-037-9178 has 1 manufacturer part number on file: 25-1009AW-02B-XFF-30/0/300 PSI (Ashcroft Inc Dba Heise).
2 possible matches (shared part number, not a government interchangeability claim): 4520-01-428-3143, 5140-01-684-6335. Verify interchangeability with system specifications before substitution.
Key specifications for 25-1009AW-02B-XFF-30/0/300 PSI: Mounting Hole Quantity: 3; Scale Accuracy: 1 PCT ENTIRE RANGE; Scale Name: PRESSURE-VACUUM; Overall Diameter: 3.688 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.