The Tool,whistle, cataloged under National Stock Number 4240-01-358-2925, 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 Avon - International Safety Instruments, Inc. Dba I S I Div Isi. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-358-2925 |
| Primary Part Number | 074.010.00 |
| Item Name | Tool,whistle |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Avon - International Safety Instruments, Inc. Dba I S I Div Isi |
| Status | ACTIVE |
| General Characteristics Item Description | DIRECT REPLACEMENT PART USED ON 3O MIN. AIR PACK,ISI RANGER BREATHING EQUIPMENT |
| 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 |
|---|---|
| 074.010.00 PRIMARY | Avon - International Safety Instruments, Inc. Dba I S I Div Isi (USA) |
NSN 4240-01-358-2925 is a Tool,whistle, manufactured by Avon - International Safety Instruments, Inc. Dba I S I Div Isi, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-358-2925 has 1 manufacturer part number on file: 074.010.00 (Avon - International Safety Instruments, Inc. Dba I S I Div Isi).
Key specifications for 074.010.00: General Characteristics Item Description: DIRECT REPLACEMENT PART USED ON 3O MIN. AIR PACK,ISI RANGER BREATHING EQUIPMENT; Special Features: REPLACEMENT OR REPAIRS SHALL BE DONE ONLY WITH PARTS DESIGNED FOR THE RESPIRATOR. 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.