The Protector,hearing, cataloged under National Stock Number 4240-01-684-1729, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-684-1729 |
| Item Name | Protector,hearing |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| Material | STEEL HEADBAND |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| H10P3G-290 | 3/9 Design control — primary reference 3m Company |
| 7100242351 | C/1 Advisory reference — outside the item-of-supply concept 3m Company |
NSN 4240-01-684-1729 is a Protector,hearing, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
Key specifications for 4240-01-684-1729: Special Features: PATENTED LIQUID & FOAM FILLED CUSHIONS,STAINLESS STEEL HEADBAND WIRED WITH FOUR POINT SUSPENSION,BLACK/RED; Part Name Assigned by Controlling Agency: HELMET ATTACHED EARMUFF; Material: STEEL HEADBAND. 1 specification is 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.