The Mask,air Line, cataloged under National Stock Number 4240-01-251-9401, 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 Mine Safety Appliances Company. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-251-9401 |
| Primary Part Number | E-UB1311-5M413-1 |
| Item Name | Mask,air Line |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Hazardous per DLA record (HMIC Y) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| E-UB1311-5M413-1 PRIMARY | Mine Safety Appliances Company (USA) |
| Reference | Meaning |
|---|---|
| 481223 | 5/9 Secondary reference Mine Safety Appliances Company |
| C-UB111M2101 | 5/9 Secondary reference Mine Safety Appliances Company |
| 484936 | 5/9 Secondary reference Mine Safety Appliances Company |
| E-UB1311-5M410-1 | 5/9 Secondary reference Mine Safety Appliances Company |
| 801378 | 5/9 Secondary reference Mine Safety Appliances Company |
| D-UB1311-5M410-1 | 5/9 Secondary reference Mine Safety Appliances Company |
NSN 4240-01-251-9401 is a Mask,air Line, manufactured by Mine Safety Appliances Company, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-251-9401 has 1 manufacturer part number on file: E-UB1311-5M413-1 (Mine Safety Appliances Company).
Key specifications for E-UB1311-5M413-1: Criticality Code Justification: FEAT; Special Features: SOLE SOURCE REQUIRED BY STATUTE 6.302. 1 specification is documented in the U.S. Government catalog.
Hazardous per DLA record (HMIC Y). 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.