The Respirator,air Filtering, cataloged under National Stock Number 4240-01-251-1575, is classified within Federal Supply Class 4240 (No Item Name Available) of the Fire Fighting, Rescue, and Safety Equipment group. The primary manufacturer of record is Square D Co Monroe Plant. Government technical data includes 10 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 4 commercial cross-references from 3 manufacturers, enabling identification through both NSN and commercial part number lookups. 7 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-251-1575 |
| Primary Part Number | S4530 |
| Item Name | Respirator,air Filtering |
| FSC / FSG | 4240 / 42 — No Item Name Available |
| Manufacturer | Square D Co Monroe Plant |
| Status | ACTIVE |
| Material Type | ELASTIC |
| Mask Filter Quantity | 2 |
| Filter Replaceability | REPLACEABLE |
| Adjustability | ADJUSTABLE |
| Filter Type | CARTRIDGE AND FILTER PAD |
| Material | RUBBER SILICONE CLASS Q MASK |
| Exhaust Valve | INCLUDED |
| Mask Type | HALF FACEPIECE |
| Criticality Code Justification | FEAT |
| Head Harness | INCLUDED |
| Acquisition Status | ACTIVE |
| HAZMAT | No |
NSN 4240-01-251-1575 is a Respirator,air Filtering, manufactured by Square D Co Monroe Plant, classified under FSC 4240 (No Item Name Available). Status: active.
NSN 4240-01-251-1575 has 4 cross-referenced part numbers: S4530 (American Optical Co), S4530 (Square D Co Monroe Plant), 50446 (American Optical Co), 50446 (Aearo Company).
There are 7 known substitutes for 4240-01-251-1575: 9540-00-027-9154, 1005-00-441-7725, 1005-00-602-1925 and 4 more. Verify interchangeability with system specifications before substitution.
Key specifications for S4530: Material Type: ELASTIC; Mask Filter Quantity: 2; Filter Replaceability: REPLACEABLE; Adjustability: ADJUSTABLE. 11 total characteristics are documented in the Federal Logistics Information System.