The Transformer,audio Frequency, cataloged under National Stock Number 5950-01-090-9131, is classified within Federal Supply Class 5950 (Coils and Transformers) of the Electrical and Electronic Equipment Components group. The manufacturer of record is Automation Products Group, Inc.. Government technical data includes 17 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5950-01-090-9131 |
| Primary Part Number | 9-305-4 |
| Item Name | Transformer,audio Frequency |
| FSC / FSG | 5950 / 59 — Coils and Transformers |
| Manufacturer | Automation Products Group, Inc. |
| Status | ACTIVE |
| Mounting Facility Quantity | 2 SINGLE GROUP |
| Inclosure Type | FULLY INCLOSED |
| Mounting Method | THREADED HOLE(S) SINGLE GROUP |
| Body Width | 0.880 INCHES NOMINAL IN |
| Body Height | 0.830 INCHES MAXIMUM IN |
| Winding Function and Quantity | 1 PRIMARY AND 1 SECONDARY SINGLE COMPONENT |
| Impedance Rating in Ohms | 2000.0 NOMINAL SINGLE COMPONENT SINGLE PRIMARY |
| Impedance Rating in Ohms | 37.5 NOMINAL SINGLE COMPONENT SINGLE SECONDARY |
| Winding Shielding Method | EXTERNAL INCLOSURE GROUNDED AND BROUGHT OUT TO TERMINAL SINGLE COMPONENT |
| Distance Between Mounting Facility Centers | 1.200 INCHES NOMINAL SINGLE MOUNTING FACILITY SINGLE CENTER GROUP IN |
| Nominal Thread Size | 0.086 INCHES SINGLE GROUP IN |
| Body Length | 1.400 INCHES NOMINAL IN |
| Reliability Indicator | NOT ESTABLISHED |
| Frequency Rating | 1.0 MEGAHERTZ NOMINAL SINGLE COMPONENT |
| Primary to Secondary Turn Ratio | 1 TO 1 SINGLE COMPONENT |
| Terminal Type and Quantity | 4 SOLDER STUD AND 1 WIRE LEAD |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) SINGLE GROUP |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 9-305-4 PRIMARY | Automation Products Group, Inc. (USA) |
| Reference | Meaning |
|---|---|
| C8839-4 | 7/2 Vendor item drawing reference U.S. Government activity |
| 5950PL0916713 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| X1215 | 5/9 Secondary reference U.S. Government activity |
| 9-232-4 | 5/9 Secondary reference Automation Products Group, Inc. |
| X-1215-1 | 5/2 Secondary reference U.S. Government activity |
| 5950PL1821148 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5950-01-090-9131 is a Transformer,audio Frequency, manufactured by Automation Products Group, Inc., classified under FSC 5950, Coils and Transformers. Status: active.
NSN 5950-01-090-9131 has 1 manufacturer part number on file: 9-305-4 (Automation Products Group, Inc.).
3 possible matches (shared part number, not a government interchangeability claim): 4920-01-300-1992, 4730-01-528-9795, 6515-01-583-5477. Verify interchangeability with system specifications before substitution.
Key specifications for 9-305-4: Mounting Facility Quantity: 2 SINGLE GROUP; Inclosure Type: FULLY INCLOSED; Mounting Method: THREADED HOLE(S) SINGLE GROUP; Body Width: 0.880 INCHES NOMINAL IN. 17 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.
NSN 5950-01-090-9131 has DEMIL Code B. 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.