The Facepiece,breathing Equipment, cataloged under National Stock Number 4240-01-396-9540, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Mine Safety Appliances Company. Government technical data includes 6 specifications, 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-396-9540 |
| Primary Part Number | 472666 |
| Item Name | Facepiece,breathing Equipment |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| Facepiece Design | FULL |
| Facepiece Size Designation | MEDIUM |
| Spectacle Usage Provision | NOT PROVIDED |
| Facepiece Speaking Diaphragm | NOT INCLUDED |
| Material | RUBBER SYNTHETIC FACEPIECE |
| Material | GLASS FACEPIECE LENS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 472666 PRIMARY | Mine Safety Appliances Company (USA) |
NSN 4240-01-396-9540 is a Facepiece,breathing Equipment, manufactured by Mine Safety Appliances Company, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-396-9540 has 1 manufacturer part number on file: 472666 (Mine Safety Appliances Company).
Key specifications for 472666: Facepiece Design: FULL; Facepiece Size Designation: MEDIUM; Spectacle Usage Provision: NOT PROVIDED; Facepiece Speaking Diaphragm: NOT INCLUDED. 6 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.
NSN 4240-01-396-9540 has DEMIL Code F. 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.