The Mask,chemical-Biological, cataloged under National Stock Number 4240-01-692-5928, 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 Stc S.r.l Unipersonale. Government technical data includes 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-692-5928 |
| Primary Part Number | STC 4251 |
| Item Name | Mask,chemical-Biological |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Stc S.r.l Unipersonale |
| Status | ACTIVE |
| Filter Type | FILTER ELEMENT |
| Face Cover Type | MUZZLE |
| 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 |
|---|---|
| STC 4251 | Stc S.r.l Unipersonale (ITA) |
| Reference | Meaning |
|---|---|
| 4251 | 3/9 Design control — primary reference 3m Company Dba 3m |
NSN 4240-01-692-5928 is a Mask,chemical-Biological, manufactured by Stc S.r.l Unipersonale, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-692-5928 has 1 manufacturer part number on file: STC 4251 (Stc S.r.l Unipersonale).
Key specifications for STC 4251: Filter Type: FILTER ELEMENT; Face Cover Type: MUZZLE; Special Features: FOR GASES AND ORGANIC VAPORTS, FILTERS PARTICULATES; Part Name Assigned by Controlling Agency: PAINT SPRAY RESPIRATOR. 2 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.