The Gage,compound Pressure-Vacuum,di, cataloged under National Stock Number 6685-01-162-5075, 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 Hydranautics. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 4 items share a part number with this NSN in the catalog (possible match — not a government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 | 6685-01-162-5075 |
| Primary Part Number | 51878-1 |
| Item Name | Gage,compound Pressure-Vacuum,di |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Hydranautics |
| Status | ACTIVE |
| Scale Accuracy | 1 PCT FULL SCALE |
| Scale Name | PRESSURE-VACUUM |
| Overall Diameter | 4.090 INCHES NOMINAL IN |
| Actuation Type | BOURDON TUBE |
| Connection Type | EXTERNAL |
| Scale Range | +0.0 TO 150.0 POUNDS OF VACUUM PER SQUARE INCH LBS |
| Pointer Type | INDICATING |
| Adjustability | ADJUSTABLE |
| Scale Type | ARC |
| Graduation Unit | 30.0 INCHES OF MERCURY IN |
| Connection Location | BOTTOM REAR |
| Scale Length | 3.920 INCHES NOMINAL IN |
| Material | STEEL COMP 304 CASE |
| Material | STEEL COMP 316 ACTUATING ELEMENT |
| Connection Quantity | 1 |
| Connection Size | 0.500 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 |
|---|---|
| 51878-1 PRIMARY | Hydranautics (USA) |
| 52046-1 | Hydranautics (USA) |
| 2914201-30 PRIMARY | Cosmodyne, Llc Dba Cosmodyne Llc (USA) |
| 44-GXX-06 PRIMARY | United Instrument Inc (USA) |
| Reference | Meaning |
|---|---|
| 13226E8464 | 7/2 Vendor item drawing reference U.S. Government activity |
| 52046 | D/9 Drawing number reference only Hydranautics |
NSN 6685-01-162-5075 is a Gage,compound Pressure-Vacuum,di, manufactured by Hydranautics, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-162-5075 has 4 manufacturer part numbers on file: 51878-1 (Hydranautics), 52046-1 (Hydranautics), 2914201-30 (Cosmodyne, Llc Dba Cosmodyne Llc), 44-GXX-06 (United Instrument Inc).
4 possible matches (shared part number, not a government interchangeability claim): 5961-01-168-4088, 4820-01-438-0587, 5365-01-494-8022. Verify interchangeability with system specifications before substitution.
Key specifications for 51878-1: Scale Accuracy: 1 PCT FULL SCALE; Scale Name: PRESSURE-VACUUM; Overall Diameter: 4.090 INCHES NOMINAL IN; Actuation Type: BOURDON TUBE. 16 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.