The Side Voicemeter Ay, cataloged under National Stock Number 4240-01-260-8701, 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 Ilc Dover Lp. 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-260-8701 |
| Primary Part Number | 5-1-1047 |
| Item Name | Side Voicemeter Ay |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Ilc Dover Lp |
| Status | ACTIVE |
| General Characteristics Item Description | C/O 1,5-1-1071,DIAPHRAM;1,5-1-1072,GASKET;1,5-1-1074,REAR BAFFLES;1,5-1-1073,BAFFLE SUBASSEMBLY;1.500 INS.O/ADIA;0.136 IN THICK IN |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 5-1-1047 | Ilc Dover Lp (USA) |
| Reference | Meaning |
|---|---|
| 5-1-1047 | 3/2 Design control — primary reference U.S. Government activity |
| 04736 | 5/9 Secondary reference Kramer Industries |
| 5-1-1047 | 5/1 Secondary reference Ilc Dover Lp Dba Ilc Manufactured Products Division Div a Division of Ilc Dover Lp |
| 304736 | 5/1 Secondary reference Mine Safety Appliances Company |
| 305374 | 5/9 Secondary reference Mine Safety Appliances Company |
NSN 4240-01-260-8701 is a Side Voicemeter Ay, manufactured by Ilc Dover Lp, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-260-8701 has 1 manufacturer part number on file: 5-1-1047 (Ilc Dover Lp).
1 possible match (shared part number, not a government interchangeability claim): 5930-01-348-7191. Verify interchangeability with system specifications before substitution.
Key specifications for 5-1-1047: General Characteristics Item Description: C/O 1,5-1-1071,DIAPHRAM;1,5-1-1072,GASKET;1,5-1-1074,REAR BAFFLES;1,5-1-1073,BAFFLE SUBASSEMBLY;1.500 INS.O/ADIA;0.136 IN THICK IN; Criticality Code Justification: FEAT; Special Features: WEAPON SYSTEM ESSENTIAL: SIDE VOICEMETER ASSEMBLY; End Item Identification: MASK, PROTECTIVE, GEN/SPL PURPOSE (M40, M17, M9 SERIES); MASK CHEMICAL BIO M42A2 SMALL/MED/LARGE. 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.
NSN 4240-01-260-8701 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
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.