The Cartridge,respirator,air Filteri, cataloged under National Stock Number 4240-01-250-2283, 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 Square D Co Monroe Plant. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-250-2283 |
| Primary Part Number | R722A |
| Item Name | Cartridge,respirator,air Filteri |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Square D Co Monroe Plant |
| Status | ACTIVE |
| FSC Application Data | RESPIRATOR,AIR FILTERING |
| Hazard Protection Feature | ACID GAS |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| R722A PRIMARY | Square D Co Monroe Plant (USA) |
| Reference | Meaning |
|---|---|
| R722A | 5/9 Secondary reference American Optical Co |
| 51419 | 5/9 Secondary reference American Optical Co |
| 51419 | 5/9 Secondary reference U.S. Government activity |
NSN 4240-01-250-2283 is a Cartridge,respirator,air Filteri, manufactured by Square D Co Monroe Plant, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-250-2283 has 1 manufacturer part number on file: R722A (Square D Co Monroe Plant).
2 possible matches (shared part number, not a government interchangeability claim): 5325-01-651-2975, 5220-01-699-2158. Verify interchangeability with system specifications before substitution.
Key specifications for R722A: FSC Application Data: RESPIRATOR,AIR FILTERING; Hazard Protection Feature: ACID GAS; Criticality Code Justification: FEAT; Special Features: NIOSH APPROVAL NO. TC-23C-601; SOLE SOURCE REQUIRED BY STATUTE 6.302; USED ON AMERICAN OPTICAL ESCAPE ARTIST MOUTHPIECE RESPIRATORS. 3 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.