The Bit,mouthpiece,breathing Apparat, cataloged under National Stock Number 4240-01-445-4740, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Bit,mouthpiece,breathing Apparat |
| FSC / FSG | 4240 — Safety and Rescue Equipment (FSG 42) |
| Parameter | Value |
|---|---|
| NSN | 4240-01-445-4740 |
| Item Name | Bit,mouthpiece,breathing Apparat |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Reference | Meaning |
|---|---|
| 1058-38 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4240-01-445-4740 is a Bit,mouthpiece,breathing Apparat, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 7021-01-466-4362. Verify interchangeability with system specifications before substitution.
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.