The Protector,hearing, cataloged under National Stock Number 4240-01-675-5209, 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 4 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4240-01-675-5209 |
| Primary Part Number | X4A |
| Item Name | Protector,hearing |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | 3m Company |
| Status | ACTIVE |
| Body Style | HEADSET, COVERED |
| Unpackaged Unit Weight | 8.25 OUNCES OZ |
| Headband Type | ADJUSTABLE SINGLE BAND |
| Material | PLASTIC AND STEEL CORROSION RESISTING HEADBAND |
| 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 |
|---|---|
| X4A PRIMARY | 3m Company (USA) |
| 02188078 | Blackwood J. Blackwood & Son Pty Ltd (AUS) |
| 7000104073 PRIMARY | 3m Company (USA) |
| Reference | Meaning |
|---|---|
| XA007707947 | 5/9 Secondary reference 3m Company |
NSN 4240-01-675-5209 is a Protector,hearing, manufactured by 3m Company, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-675-5209 has 3 manufacturer part numbers on file: X4A (3m Company), 02188078 (Blackwood J. Blackwood & Son Pty Ltd), 7000104073 (3m Company).
Key specifications for X4A: Body Style: HEADSET, COVERED; Unpackaged Unit Weight: 8.25 OUNCES OZ; Headband Type: ADJUSTABLE SINGLE BAND; Special Features: GREEN AND BLACK. 4 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.