The Gage,pressure,dial Indicating, cataloged under National Stock Number 6685-01-291-7522, 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 Chase Supply, Inc. Dba Chase Defense Partners. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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,pressure,dial Indicating |
| FSC / FSG | 6685 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments (FSG 66) |
| Manufacturers | Chase Supply, Inc. Dba Chase Defense Partners (CAGE 1RZM1) |
| Parameter | Value |
|---|---|
| NSN | 6685-01-291-7522 |
| Primary Part Number | 521433-6 |
| Item Name | Gage,pressure,dial Indicating |
| FSC / FSG | 6685 / 66 — Pressure, Temperature, and Humidity Measuring and Controlling Instruments |
| Manufacturer | Chase Supply, Inc. Dba Chase Defense Partners |
| 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 |
|---|---|
| 521433-6 | Chase Supply, Inc. Dba Chase Defense Partners (USA) |
| Reference | Meaning |
|---|---|
| 521433-6 | 3/2 Design control — primary reference U.S. Government activity |
| SG4ND5KPWCONAG | 5/9 Secondary reference U.S. Government activity |
| MIL-G-18997 | 5/9 Secondary reference U.S. Government activity |
| 25544-35MF31MLG | 5/9 Secondary reference 3d Instruments, Lp Dba Sierra Precision |
NSN 6685-01-291-7522 is a Gage,pressure,dial Indicating, manufactured by Chase Supply, Inc. Dba Chase Defense Partners, classified under FSC 6685, Pressure, Temperature, and Humidity Measuring and Controlling Instruments. Status: active.
NSN 6685-01-291-7522 has 1 manufacturer part number on file: 521433-6 (Chase Supply, Inc. Dba Chase Defense Partners).
1 possible match (shared part number, not a government interchangeability claim): 6685-01-556-1029. 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.