The Magneto,ignition, cataloged under National Stock Number 2920-00-640-7559, is classified within Federal Supply Class 2920 (Engine Electrical System Components, Nonaircraft) of the Engine Accessories group. The manufacturer of record is United Technologies Corp Electro Systems Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2920-00-640-7559 |
| Primary Part Number | MJB4A104 |
| Item Name | Magneto,ignition |
| FSC / FSG | 2920 / 29 — Engine Electrical System Components, Nonaircraft |
| Manufacturer | United Technologies Corp Electro Systems Inc |
| Status | ACTIVE |
| Mounting Facility Quantity | 4 |
| Mounting Method | BASE |
| Drive Connection Type | IMPULSE COUPLED |
| Pole Quantity | 2 |
| Mounting Facility Thread Quantity Per Inch | 16 |
| Shaft Rotation Direction | CLOCKWISE |
| Distance Between Mounting Facility Centers | 1.968 INCHES NOMINAL IN |
| Body Material | ALUMINUM ALLOY |
| Mounting Facility Thread Diameter | 0.375 INCHES NOMINAL IN |
| Impulse Quantity Per Revolution | 4 |
| Contact Set Quantity | 1 |
| Mounting Facility | THREADED HOLE(S) |
| Surface Treatment | ENAMEL |
| Ignition Type for Which Designed | SINGLE |
| Performance Type | HIGH TENSION |
| Rotation Element Type | PERMANENT MAGNET ROTOR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| MJB4A104 PRIMARY | United Technologies Corp Electro Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| MJB4A104 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
NSN 2920-00-640-7559 is a Magneto,ignition, manufactured by United Technologies Corp Electro Systems Inc, classified under FSC 2920, Engine Electrical System Components, Nonaircraft. Status: active.
NSN 2920-00-640-7559 has 1 manufacturer part number on file: MJB4A104 (United Technologies Corp Electro Systems Inc).
Key specifications for MJB4A104: Mounting Facility Quantity: 4; Mounting Method: BASE; Drive Connection Type: IMPULSE COUPLED; Pole Quantity: 2. 16 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). 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.