The Mask,chemical-Biological, cataloged under National Stock Number 4240-01-258-0061, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 18 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-258-0061 |
| Item Name | Mask,chemical-Biological |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Hose Quantity | 1 |
| Filter Type | CANISTER |
| Quantity | 1 |
| Microphone | INCLUDED |
| Spectacle Usage Provision | PROVIDED |
| Canister to Facepiece Attachment Method | HOSE |
| Carrying Facility | CARRIER |
| Facepiece Speaking Diaphragm | INCLUDED |
| Carrying Position for Which Designed | LEFT SIDE OR RIGHT SIDE |
| Quick Disconnect Coupling Feature | INCLUDED |
| Size Designation | SMALL |
| Canister Carrying Harness | INCLUDED |
| Face Cover Type | FACEPIECE |
| Protection for Which Filter Is Designed | WAR GASES |
| Material | PLASTIC LENS |
| Material | RUBBER LOCATION NOT OTHERWISE SPECIFIED |
| Canister Manufacturer Symbol | PALL |
| Particulate Filter | NOT INCLUDED |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | N |
| Reference | Meaning |
|---|---|
| 5-1-1000-10 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4240-01-258-0061 is a Mask,chemical-Biological, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
Key specifications for 4240-01-258-0061: Hose Quantity: 1; Filter Type: CANISTER; Quantity: 1; Microphone: INCLUDED. 18 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4240-01-258-0061 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.