The Gage,compound Pressure-Vacuum,di, cataloged under National Stock Number 6685-01-256-0540, 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 Carrier Corp. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Gage,compound Pressure-Vacuum,di |
| FSC / FSG | 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments (FSG 66) |
| Manufacturers | Saab Kockums Aktiebolag (CAGE A199N); Carrier Corp (CAGE 10855) |
| Parameter | Value |
|---|---|
| NSN | 6685-01-256-0540 |
| Primary Part Number | 66U1-3303-1 |
| Item Name | Gage,compound Pressure-Vacuum,di |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Carrier Corp |
| Status | ACTIVE |
| 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 |
|---|---|
| 51450055 | Saab Kockums Aktiebolag (SWE) |
| 66U1-3303-1 PRIMARY | Carrier Corp (USA) |
| Reference | Meaning |
|---|---|
| 51450055 | 5/9 Secondary reference Saab Kockums Ab - Karlskrona |
NSN 6685-01-256-0540 is a Gage,compound Pressure-Vacuum,di, manufactured by Carrier Corp, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-256-0540 has 2 manufacturer part numbers on file: 51450055 (Saab Kockums Aktiebolag), 66U1-3303-1 (Carrier Corp).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-293-2577. Verify interchangeability with system specifications before substitution.
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.