The Harness Assembly,mask,oxygen, cataloged under National Stock Number 4240-01-464-7839, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4240-01-464-7839 |
| Item Name | Harness Assembly,mask,oxygen |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Color | BLACK |
| Material | FABRIC, NYLON AND PLASTIC POLYESTER AND COTTON |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 5-1-2796 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4240-01-464-7839 is a Harness Assembly,mask,oxygen, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
Key specifications for 4240-01-464-7839: Color: BLACK; Special Features: MATERIAL CONSISTS OF POLYESTER, COTTON AND NYLON, COLOR: BLACK, THREAD: POLYESTER, TYPE 1 OR 2, CLASS 1, SUBCLASS B SIZE E-3, WEBBING: NYLON AND ELASTIC, INNER AND OUTER 2 AND 1/2 WIDE PAD COTTON, TYPE 2A, CLASS 4 A; End Item Identification: CHEMICAL-BIOLOGICAL MASK, M40/M40A1/M42/M42A2; Material: FABRIC, NYLON AND PLASTIC POLYESTER AND COTTON. 2 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 4240-01-464-7839 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.