The Gage,differential,dial Indicatin, cataloged under National Stock Number 6685-01-556-2139, 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 Dwyer Instruments Ltd. Government technical data includes 10 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6685-01-556-2139 |
| Primary Part Number | 2001D |
| Item Name | Gage,differential,dial Indicatin |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Dwyer Instruments Ltd |
| Status | ACTIVE |
| Scale Accuracy | 2% ACCURACY FULL RANGE |
| Scale Name | DIFFERENTIAL PRESSURE |
| Scale Inscription/background Color | BLACK FIGURES ON WHITE BACKGROUND |
| Scale Range | +0.0 TO 1.0 INCHES OF WATER IN |
| Pointer Type | INDICATING |
| Adjustability | ADJUSTABLE |
| Scale Type | DIAL |
| Dial Size | 4.0 INCH DIAMETER IN |
| Graduation Unit | 0.2 INCHES IN |
| Pointer Color | BLACK |
| 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 |
|---|---|
| 2001D | Dwyer Instruments Ltd (GBR) |
| AHMA250PADWYER | Daikin Applied (uk) (GBR) |
| N18010175 | J & E Hall Ltd (GBR) |
| Reference | Meaning |
|---|---|
| 2001D | 5/9 Secondary reference Meggitt Defense Systems Caswell Inc. |
| 2001D | 3/2 Design control — primary reference U.S. Government activity |
NSN 6685-01-556-2139 is a Gage,differential,dial Indicatin, manufactured by Dwyer Instruments Ltd, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-556-2139 has 3 manufacturer part numbers on file: 2001D (Dwyer Instruments Ltd), AHMA250PADWYER (Daikin Applied (uk)), N18010175 (J & E Hall Ltd).
Key specifications for 2001D: Scale Accuracy: 2% ACCURACY FULL RANGE; Scale Name: DIFFERENTIAL PRESSURE; Scale Inscription/background Color: BLACK FIGURES ON WHITE BACKGROUND; Scale Range: +0.0 TO 1.0 INCHES OF WATER IN. 10 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.