The Mask,chemical-Biological, cataloged under National Stock Number 4240-00-293-7751, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4240-00-293-7751 |
| Item Name | Mask,chemical-Biological |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Carrier Position Type | TWO POSITION |
| Hose Quantity | 1 |
| Filter Type | CANISTER |
| Mask Not in Use Carrier Wearing Position | LEFT SIDE |
| Quantity | 1 |
| Microphone | NOT INCLUDED |
| Spectacle Usage Provision | PROVIDED |
| Canister to Facepiece Attachment Method | HOSE |
| Carrying Facility | CARRIER |
| Accessory Components and Quantity | ANTIFOGGING KIT 1,WATERPROOFING SET 1 |
| Facepiece Speaking Diaphragm | NOT INCLUDED |
| Quick Disconnect Coupling Feature | NOT INCLUDED |
| Size Designation | SMALL |
| Canister Carrying Harness | NOT INCLUDED |
| Face Cover Type | FACEPIECE |
| Protection for Which Filter Is Designed | WAR GASES AND BIOLOGICAL ORGANISMS AND RADIOACTIVE DUSTS |
| Material | RUBBER POLYISOPRENE NATURAL CLASS NR LOCATION NOT OTHERWISE SPECIFIED |
| Material | GLASS SAFETY LENS |
| Particulate Filter | INCLUDED |
| Carrier Wearing Position | CHEST |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 510723 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4240-00-293-7751 is a Mask,chemical-Biological, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
Key specifications for 4240-00-293-7751: Carrier Position Type: TWO POSITION; Hose Quantity: 1; Filter Type: CANISTER; Mask Not in Use Carrier Wearing Position: LEFT SIDE. 20 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 4240-00-293-7751 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.