The Generator,engine Accessory, cataloged under National Stock Number 2920-00-439-2872, is classified within Federal Supply Class 2920 (Engine Electrical System Components, Nonaircraft) of the Engine Accessories group. The manufacturer of record is C E Niehoff & Co. Government technical data includes 30 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 2920-00-439-2872 |
| Primary Part Number | A505A |
| Item Name | Generator,engine Accessory |
| FSC / FSG | 2920 / 29 — Engine Electrical System Components, Nonaircraft |
| Manufacturer | C E Niehoff & Co |
| Status | ACTIVE |
| Distance Between Shaft Center and Bottom Mounting Hole Center | 4.688 INCHES NOMINAL IN |
| Shaft Drive End Style | STRAIGHT SHAFT END, THREADED, W/KEYWAY |
| Distance Between Outside Surfaces of Hinge Bracket | 7.125 INCHES NOMINAL IN |
| Grounding Method | INTERNAL |
| Thread Series | UNF |
| Distance From End to Keyway Center | 1.062 INCHES NOMINAL IN |
| Distance Between Inside Surfaces of Hinge Bracket | 6.125 INCHES NOMINAL IN |
| Thread Length | 0.828 INCHES NOMINAL IN |
| Bottom Mounting Hole Diameter | 0.441 INCHES MINIMUM AND 0.461 INCHES MAXIMUM IN |
| Mounting Style | BRACKET MTD W/THREE MTG HOLES, TOP HOLE THREADED |
| Voltage in Volts | 28.0 |
| Thread Diameter | 0.750 INCHES NOMINAL IN |
| Shaft Rotation Direction | CLOCKWISE |
| Mounting Hole Thread Class | 2B |
| Angular Deviation of First Hole From Top Center in Deg | 170.0 |
| Mounting Hole Thread Diameter | 0.375 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Maximum Operating Altitude Rating | 10000.0 FEET FT |
| Second Step Diameter | 0.780 INCHES NOMINAL IN |
| Mounting Hole Thread Direction | RIGHT-HAND |
| Distance Between Shaft Center and Top Mounting Hole Center | 4.375 INCHES MINIMUM AND 4.875 INCHES MAXIMUM IN |
| Mounting Hole Thread Quantity Per Inch | 16 |
| Maximum Rated Armature Speed in RPM | 3000 |
| Keyway Width | 0.186 INCHES MINIMUM AND 0.188 INCHES MAXIMUM IN |
| Environmental Protection | CORROSION RESISTANT AND FUNGUS RESISTANT |
| Ground Polarity Type | NEGATIVE |
| Thread Quantity Per Inch | 16 |
| Submersibility | SUBMERSIBLE |
| Maximum Output Current Rating in Amps | 230.0 |
| Furnished Items | RADIO INTERFERENCE SHIELDING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| A505A | C E Niehoff & Co (USA) |
| Reference | Meaning |
|---|---|
| 2586556 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2920-00-439-2872 is a Generator,engine Accessory, manufactured by C E Niehoff & Co, classified under FSC 2920, Engine Electrical System Components, Nonaircraft. Status: active.
NSN 2920-00-439-2872 has 1 manufacturer part number on file: A505A (C E Niehoff & Co).
Key specifications for A505A: Distance Between Shaft Center and Bottom Mounting Hole Center: 4.688 INCHES NOMINAL IN; Shaft Drive End Style: STRAIGHT SHAFT END, THREADED, W/KEYWAY; Distance Between Outside Surfaces of Hinge Bracket: 7.125 INCHES NOMINAL IN; Grounding Method: INTERNAL. 30 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.
NSN 2920-00-439-2872 has DEMIL Code D. 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.