The Magneto,ignition, cataloged under National Stock Number 2920-00-786-2839, is classified within Federal Supply Class 2920 (Engine Electrical System Components, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Ambac International Corporation Div Ambac International. Government technical data includes 23 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2920-00-786-2839 |
| Primary Part Number | MRA6B309 |
| Item Name | Magneto,ignition |
| FSC / FSG | 2920 / 29 — Engine Electrical System Components, Nonaircraft |
| Manufacturer | Ambac International Corporation Div Ambac International |
| Status | ACTIVE |
| Mounting Standard Controlling Agency | SAE |
| Mounting Facility Quantity | 1 |
| Mounting Slot Length | 1.137 INCHES NOMINAL IN |
| Mounting Method | FLANGE |
| Drive Connection Type | IMPULSE COUPLED |
| Pole Quantity | 2 |
| Mounting Facility Thread Quantity Per Inch | 16 |
| Shaft Rotation Direction | COUNTERCLOCKWISE |
| Features Provided | RADIO INTERFERENCE SHIELDING |
| Distance Between Mounting Facility Centers | 4.182 INCHES MINIMUM AND 4.194 INCHES MAXIMUM IN |
| Body Material | MAGNESIUM |
| Mounting Facility Thread Diameter | 0.375 INCHES NOMINAL IN |
| Impulse Quantity Per Revolution | 6 |
| Contact Set Quantity | 1 |
| Mounting Facility | SLOT AND THREADED HOLE(S) |
| Surface Treatment | ENAMEL |
| Environmental Protection | FUNGUS RESISTANT |
| Spark Plug Terminal Accommodation Thread Series | UNEF |
| Spark Plug Terminal Accommodation Thread Diameter | 0.750 INCHES NOMINAL IN |
| Ignition Type for Which Designed | SINGLE |
| Performance Type | HIGH TENSION |
| Rotation Element Type | PERMANENT MAGNET ROTOR |
| Mounting Slot Width | 0.414 INCHES MAXIMUM IN |
| 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 |
|---|---|
| MRA6309 | Ambac International Corporation Div Ambac International (USA) |
| MRA6B309 PRIMARY | Ambac International Corporation Div Ambac International (USA) |
| MJB6B309 | United Technologies Corp Electro Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| MJB6B309 | 5/9 Secondary reference Ambac International Corporation Div Ambac International |
| 10A2423 | 5/9 Secondary reference U.S. Government activity |
NSN 2920-00-786-2839 is a Magneto,ignition, manufactured by Ambac International Corporation Div Ambac International, classified under FSC 2920, Engine Electrical System Components, Nonaircraft. Status: active.
NSN 2920-00-786-2839 has 3 manufacturer part numbers on file: MRA6309 (Ambac International Corporation Div Ambac International), MRA6B309 (Ambac International Corporation Div Ambac International), MJB6B309 (United Technologies Corp Electro Systems Inc).
Key specifications for MRA6B309: Mounting Standard Controlling Agency: SAE; Mounting Facility Quantity: 1; Mounting Slot Length: 1.137 INCHES NOMINAL IN; Mounting Method: FLANGE. 23 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.