The Buzzer, cataloged under National Stock Number 6350-01-414-3390, is classified within Federal Supply Class 6350 (Miscellaneous Alarm, Signal, and Security Detection Systems) of the Alarm, Signal, and Security Detection Systems group. The manufacturer of record is Projects Unlimited Inc. Government technical data includes 7 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6350-01-414-3390 |
| Primary Part Number | AI-221 |
| Item Name | Buzzer |
| FSC / FSG | 6350 / 63 — Miscellaneous Alarm, Signal, and Security Detection Systems |
| Manufacturer | Projects Unlimited Inc |
| Status | ACTIVE |
| Terminal Type | WIRE LEAD |
| Inclosure | INCLUDED |
| Action Type | VIBRATING |
| Surface Treatment | ANODIZE |
| Frequency Rating | 400.0 HERTZ NOMINAL |
| Material | ALUMINUM |
| Current Rating in Amps | 4.5 |
| 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 |
|---|---|
| AI-221 PRIMARY | Projects Unlimited Inc (USA) |
| Reference | Meaning |
|---|---|
| 222002-003 | 5/9 Secondary reference U.S. Government activity |
| AI-105 | 5/9 Secondary reference Projects Unlimited Inc |
| 222002-003 | 5/9 Secondary reference Northrop Grumman Systems Corporation |
NSN 6350-01-414-3390 is a Buzzer, manufactured by Projects Unlimited Inc, classified under FSC 6350, Miscellaneous Alarm, Signal, and Security Detection Systems. Status: active.
NSN 6350-01-414-3390 has 1 manufacturer part number on file: AI-221 (Projects Unlimited Inc).
Key specifications for AI-221: Overall Height: 0.610 INCHES NOMINAL IN; Terminal Type: WIRE LEAD; Overall Length: 1.280 INCHES NOMINAL IN; Overall Width: 0.850 INCHES NOMINAL IN. 7 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.