The Tube,gas Detector, cataloged under National Stock Number 6665-01-512-3685, is classified within Federal Supply Class 6665 (Hazard-detecting Instruments and Apparatus) of the Instruments and Laboratory Equipment group. The manufacturer of record is Sensidyne, Lp Dba Sensidyne. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6665-01-512-3685 |
| Primary Part Number | 175U |
| Item Name | Tube,gas Detector |
| FSC / FSG | 6665 / 66 — Hazard-detecting Instruments and Apparatus |
| Manufacturer | Sensidyne, Lp Dba Sensidyne |
| 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 |
|---|---|
| 175U PRIMARY | Sensidyne, Lp Dba Sensidyne (USA) |
| Reference | Meaning |
|---|---|
| 6665NCM031109 | 5/1 Secondary reference Defense Medical Standardization Board |
| 03-1390 | 5/1 Secondary reference U.S. Government activity |
NSN 6665-01-512-3685 is a Tube,gas Detector, manufactured by Sensidyne, Lp Dba Sensidyne, classified under FSC 6665, Hazard-detecting Instruments and Apparatus. Status: active.
NSN 6665-01-512-3685 has 1 manufacturer part number on file: 175U (Sensidyne, Lp Dba Sensidyne).
1 possible match (shared part number, not a government interchangeability claim): 2815-01-543-0623. Verify interchangeability with system specifications before substitution.
Key specifications for 175U: Special Features: NITROGEN OXIDE GAS DETECTOR; GLASS TUBE; 1/2-1 STROKE; 0.5-30 PPM MEASURING RANGE; Part Name Assigned by Controlling Agency: GAS DETECTOR TUBE NITROGEN OXIDE 10S. 0 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.