The Gage,compound Pressure-Vacuum,di, cataloged under National Stock Number 6685-00-252-0557, 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 29 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 6685-00-252-0557 |
| Primary Part Number | NB14PCB4RWCX |
| 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 | 1-1/2 PCT ENTIRE PRESSURE RANGE,2 PCT BETWEEN 5 IN. AND 30 IN. MERCURY IN |
| Scale Name | PRESSURE-VACUUM |
| Overall Diameter | 5.812 INCHES NOMINAL IN |
| Actuation Type | DOUBLE BOURDON TUBE |
| Mounting Method | SURFACE WALL |
| Scale Inscription/background Color | WHITE MARKINGS ON BLACK BACKGROUND |
| Scale Smallest Increment | 1.0 INCHES OF MERCURY (INHG) AND 1.0 POUNDS PER SQUARE INCH (PSI) LBS |
| Connection Type | EXTERNAL |
| Scale Range | +0.0 TO 30.0 INCHES OF MERCURY AND +0.0 TO 30.0 POUNDS PRESSURE PER SQUARE INCH LBS |
| Mounting Hole Diameter | 0.218 INCHES NOMINAL IN |
| Scale Name for Which Pointer Is Designed | PRESSURE-VACUUM |
| Pointer Type | INDICATING |
| Adjustability | ADJUSTABLE |
| Scale Type | MULTIPLE |
| Connector Type Vent | NOT PROVIDED |
| Dial Size | 4-1/2 IN. DIA IN |
| Graduation Unit | 10.0 INCHES OF MERCURY AND 5.0 POUNDS PER SQUARE INCH LBS |
| Bolt Circle Diameter | 5.375 INCHES NOMINAL IN |
| Connection Location | BACK |
| Pointer Color | ORANGE AND WHITE |
| Surface Treatment | EPOXY CASE |
| Unable to Decode | UNABLE TO DECODE |
| Material | PLASTIC CASE |
| Material | GLASS PROTECTIVE CRYSTAL |
| Material | BRONZE ACTUATING ELEMENT |
| Connection Quantity | 2 |
| Bezel Type | SLIPS-ON |
| Connection Size | 0.250 IN. NPT 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 |
|---|---|
| NB14PCB4RWCX PRIMARY | Ashcroft Inc Dba Heise (USA) |
| Reference | Meaning |
|---|---|
| HR22759 | 5/9 Secondary reference Ecolaire Inc Baldwin-Hamilton Co Div |
| 63791 | 5/9 Secondary reference Ecolaire Inc Baldwin-Hamilton Co Div |
NSN 6685-00-252-0557 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 6685-00-252-0557 has 1 manufacturer part number on file: NB14PCB4RWCX (Ashcroft Inc Dba Heise).
2 possible matches (shared part number, not a government interchangeability claim): 6105-01-186-9802, 5935-01-306-2438. Verify interchangeability with system specifications before substitution.
Key specifications for NB14PCB4RWCX: Mounting Hole Quantity: 3; Scale Accuracy: 1-1/2 PCT ENTIRE PRESSURE RANGE,2 PCT BETWEEN 5 IN. AND 30 IN. MERCURY IN; Scale Name: PRESSURE-VACUUM; Overall Diameter: 5.812 INCHES NOMINAL IN. 29 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.