The Diffusion Head Assembly, cataloged under National Stock Number 6665-01-167-0685, is classified within Federal Supply Class 6665 (Hazard-detecting Instruments and Apparatus) of the Instruments and Laboratory Equipment group. The manufacturer of record is Mine Safety Appliances Company. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 6665-01-167-0685 |
| Primary Part Number | 812518 |
| Item Name | Diffusion Head Assembly |
| FSC / FSG | 6665 / 66 — Hazard-detecting Instruments and Apparatus |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| Type/model Designation | 260 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 812518 PRIMARY | Mine Safety Appliances Company (USA) |
| Reference | Meaning |
|---|---|
| 449917 | 5/9 Secondary reference Mine Safety Appliances Company |
NSN 6665-01-167-0685 is a Diffusion Head Assembly, manufactured by Mine Safety Appliances Company, classified under FSC 6665, Hazard-detecting Instruments and Apparatus. Status: active.
NSN 6665-01-167-0685 has 1 manufacturer part number on file: 812518 (Mine Safety Appliances Company).
1 possible match (shared part number, not a government interchangeability claim): 5305-01-615-0337. Verify interchangeability with system specifications before substitution.
Key specifications for 812518: End Item Identification: 6665-01-115-7666 ALARM,GAS; Type/model Designation: 260. 1 specification is 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.
NSN 6665-01-167-0685 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.