The Indicator,pressure, cataloged under National Stock Number 6685-01-554-8812, 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 Mcdaniel Control Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Indicator,pressure |
| FSC / FSG | 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments (FSG 66) |
| Manufacturers | Mcdaniel Control Inc (CAGE 5T9T4) |
| Parameter | Value |
|---|---|
| NSN | 6685-01-554-8812 |
| Primary Part Number | Q3C |
| Item Name | Indicator,pressure |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Mcdaniel Control Inc |
| 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 |
|---|---|
| Q3C PRIMARY | Mcdaniel Control Inc (USA) |
| Reference | Meaning |
|---|---|
| 7550478-DES-021704-10 | D/9 Drawing number reference only Naval Sea Systems Command |
| G547-0002-DES-021704-10 | 5/9 Secondary reference U.S. Government activity |
| DES-021704-10 | 5/1 Secondary reference U.S. Government activity |
| DES-021704 ITEM 10 | 5/9 Secondary reference U.S. Government activity |
| 7550478 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 6685-01-554-8812 is a Indicator,pressure, manufactured by Mcdaniel Control Inc, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-554-8812 has 1 manufacturer part number on file: Q3C (Mcdaniel Control Inc).
2 possible matches (shared part number, not a government interchangeability claim): 6685-01-554-8821, 5365-01-559-3131. 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.