The Respirator,air Filtering, cataloged under National Stock Number 4240-01-300-9402, 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 3m Company. Government technical data includes 11 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4240-01-300-9402 |
| Primary Part Number | 66070 |
| Item Name | Respirator,air Filtering |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | 3m Company |
| Status | ACTIVE |
| Mask Filter Quantity | 2 |
| Filter Type | FILTER PAD |
| Mask Type | HALF FACEPIECE |
| Material Type | ELASTIC |
| Criticality Code Justification | FEAT |
| Approval Designator | ERR-060 |
| Adjustability | ADJUSTABLE |
| Exhaust Valve | INCLUDED |
| Head Harness | INCLUDED |
| Filter Replaceability | REPLACEABLE |
| Material | PLASTIC MASK |
| 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 |
|---|---|
| 66070 PRIMARY | 3m Company (USA) |
| Reference | Meaning |
|---|---|
| 70-0701-9052-8 | 5/9 Secondary reference 3m Company Div Oh&esd |
| 5201 | 5/9 Secondary reference 3m Company Div Oh&esd |
| 7000126026 | C/1 Advisory reference — outside the item-of-supply concept 3m Company |
| 5201 | 3/9 Design control — primary reference 3m Company |
NSN 4240-01-300-9402 is a Respirator,air Filtering, manufactured by 3m Company, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-300-9402 has 1 manufacturer part number on file: 66070 (3m Company).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-605-5640, 3455-01-647-0321. Verify interchangeability with system specifications before substitution.
Key specifications for 66070: Mask Filter Quantity: 2; Filter Type: FILTER PAD; Mask Type: HALF FACEPIECE; Material Type: ELASTIC. 11 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.