The Mask,air Filtering, cataloged under National Stock Number 4240-01-164-0509, 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 Biomarine Inc. 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 | 4240-01-164-0509 |
| Primary Part Number | 45-331-5 |
| Item Name | Mask,air Filtering |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Biomarine Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| 45-331-5 PRIMARY | Biomarine Inc (USA) |
NSN 4240-01-164-0509 is a Mask,air Filtering, manufactured by Biomarine Inc, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-164-0509 has 1 manufacturer part number on file: 45-331-5 (Biomarine Inc).
Key specifications for 45-331-5: Special Features: FOR BREATHING APPARATUS,4240-01-075-5550 IN AF TO. 14S5-19-11 IN. 0 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.