The Mask,air Line, cataloged under National Stock Number 4240-01-679-8586, 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 Allegro Industries. Government technical data includes 5 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 | 4240-01-679-8586 |
| Primary Part Number | 9920 |
| Item Name | Mask,air Line |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Allegro Industries |
| Status | ACTIVE |
| Harness | INCLUDED |
| Design Type | MOUTH AND NOSE |
| Microphone | NOT INCLUDED |
| Oxygen System Type | CONSTANT FLOW |
| Intake Tube Corrugated Feature | INCLUDED |
| 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 |
|---|---|
| 9920 PRIMARY | Allegro Industries (USA) |
NSN 4240-01-679-8586 is a Mask,air Line, manufactured by Allegro Industries, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-679-8586 has 1 manufacturer part number on file: 9920 (Allegro Industries).
Key specifications for 9920: Harness: INCLUDED; Design Type: MOUTH AND NOSE; Microphone: NOT INCLUDED; Oxygen System Type: CONSTANT FLOW. 5 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.